sync with latest code in madwifi
Obtained from: madwifi MFC after: 2 weeks
This commit is contained in:
sam
parent
8dc8cda8b1
commit
2b11f252e8
@ -78,7 +78,7 @@ __FBSDID("$FreeBSD$");
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#define SAMPLE_DEBUG
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#ifdef SAMPLE_DEBUG
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enum {
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ATH_DEBUG_RATE = 0x00000010, /* rate control */
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ATH_DEBUG_RATE = 0x00000010 /* rate control */
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};
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#define DPRINTF(sc, _fmt, ...) do { \
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if (sc->sc_debug & ATH_DEBUG_RATE) \
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@ -108,13 +108,17 @@ enum {
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* The difference between the algorithm in the thesis and the one in this
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* file is that the one in this file uses a ewma instead of a window.
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*
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* Also, this implementation tracks the average transmission time for
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* a few different packet sizes independently for each link.
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*/
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#define STALE_FAILURE_TIMEOUT_MS 10000
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#define MIN_SWITCH_MS 1000
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static void ath_rate_ctl_reset(struct ath_softc *, struct ieee80211_node *);
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static __inline int size_to_bin(int size)
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static __inline int
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size_to_bin(int size)
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{
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int x = 0;
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for (x = 0; x < NUM_PACKET_SIZE_BINS; x++) {
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@ -124,11 +128,13 @@ static __inline int size_to_bin(int size)
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}
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return NUM_PACKET_SIZE_BINS-1;
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}
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static __inline int bin_to_size(int index) {
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static __inline int
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bin_to_size(int index) {
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return packet_size_bins[index];
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}
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static __inline int rate_to_ndx(struct sample_node *sn, int rate) {
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static __inline int
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rate_to_ndx(struct sample_node *sn, int rate) {
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int x = 0;
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for (x = 0; x < sn->num_rates; x++) {
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if (sn->rates[x].rate == rate) {
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@ -185,6 +191,15 @@ static __inline int best_rate_ndx(struct sample_node *sn, int size_bin,
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!sn->stats[size_bin][x].packets_acked)) {
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continue;
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}
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/* 9 megabits never works better than 12 */
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if (sn->rates[x].rate == 18)
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continue;
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/* don't use a bit-rate that has been failing */
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if (sn->stats[size_bin][x].successive_failures > 3)
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continue;
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if (!best_rate_tt || best_rate_tt > tt) {
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best_rate_tt = tt;
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best_rate_ndx = x;
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@ -194,11 +209,10 @@ static __inline int best_rate_ndx(struct sample_node *sn, int size_bin,
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}
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/*
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* pick a ndx s.t. the perfect_tx_time
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* is less than the best bit-rate's average_tx_time
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* and the ndx has not had four successive failures.
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* pick a good "random" bit-rate to sample other than the current one
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*/
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static __inline int pick_sample_ndx(struct sample_node *sn, int size_bin)
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static __inline int
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pick_sample_ndx(struct sample_node *sn, int size_bin)
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{
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int x = 0;
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int current_ndx = 0;
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@ -213,24 +227,38 @@ static __inline int pick_sample_ndx(struct sample_node *sn, int size_bin)
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current_tt = sn->stats[size_bin][current_ndx].average_tx_time;
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for (x = 0; x < sn->num_rates; x++) {
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int ndx = (sn->last_sample_ndx[size_bin] + 1 + x) % sn->num_rates;
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/*
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* clear any stale stuff out.
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*/
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if (ticks - sn->stats[size_bin][ndx].last_tx > ((hz * STALE_FAILURE_TIMEOUT_MS)/1000)) {
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sn->stats[size_bin][ndx].average_tx_time = sn->stats[size_bin][ndx].perfect_tx_time;
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sn->stats[size_bin][ndx].successive_failures = 0;
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sn->stats[size_bin][ndx].tries = 0;
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sn->stats[size_bin][ndx].total_packets = 0;
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sn->stats[size_bin][ndx].packets_acked = 0;
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}
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int ndx = (sn->last_sample_ndx[size_bin]+1+x) % sn->num_rates;
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if (ndx != current_ndx &&
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sn->stats[size_bin][ndx].perfect_tx_time < current_tt &&
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sn->stats[size_bin][ndx].successive_failures < 4) {
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sn->last_sample_ndx[size_bin] = ndx;
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return ndx;
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}
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/* don't sample the current bit-rate */
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if (ndx == current_ndx)
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continue;
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/* this bit-rate is always worse than the current one */
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if (sn->stats[size_bin][ndx].perfect_tx_time > current_tt)
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continue;
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/* rarely sample bit-rates that fail a lot */
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if (ticks - sn->stats[size_bin][ndx].last_tx < ((hz * STALE_FAILURE_TIMEOUT_MS)/1000) &&
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sn->stats[size_bin][ndx].successive_failures > 3)
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continue;
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/* don't sample more than 2 indexes higher
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* for rates higher than 11 megabits
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*/
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if (sn->rates[ndx].rate > 22 && ndx > current_ndx + 2)
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continue;
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/* 9 megabits never works better than 12 */
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if (sn->rates[ndx].rate == 18)
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continue;
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/* if we're using 11 megabits, only sample up to 12 megabits
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*/
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if (sn->rates[current_ndx].rate == 22 && ndx > current_ndx + 1)
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continue;
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sn->last_sample_ndx[size_bin] = ndx;
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return ndx;
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}
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return current_ndx;
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}
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@ -243,11 +271,10 @@ ath_rate_findrate(struct ath_softc *sc, struct ath_node *an,
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struct sample_node *sn = ATH_NODE_SAMPLE(an);
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struct sample_softc *ssc = ATH_SOFTC_SAMPLE(sc);
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struct ieee80211com *ic = &sc->sc_ic;
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int ndx, size_bin, mrr, best_ndx;
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int ndx, size_bin, mrr, best_ndx, change_rates;
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unsigned average_tx_time;
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mrr = sc->sc_mrretry && !(ic->ic_flags & IEEE80211_F_USEPROT) &&
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!(frameLen > ic->ic_rtsthreshold);
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mrr = sc->sc_mrretry && !(ic->ic_flags & IEEE80211_F_USEPROT);
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size_bin = size_to_bin(frameLen);
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best_ndx = best_rate_ndx(sn, size_bin, !mrr);
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@ -256,57 +283,14 @@ ath_rate_findrate(struct ath_softc *sc, struct ath_node *an,
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} else {
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average_tx_time = 0;
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}
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if (sn->static_rate_ndx != -1) {
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ndx = sn->static_rate_ndx;
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*try0 = ATH_TXMAXTRY;
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} else {
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ndx = 0;
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*try0 = mrr ? 2 : ATH_TXMAXTRY;
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DPRINTF(sc, "%s: %s size %d mrr %d packets_sent %d best_ndx %d "
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"sample tt %d packets since %d\n"
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, __func__, ether_sprintf(an->an_node.ni_macaddr)
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, packet_size_bins[size_bin]
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, mrr
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, sn->packets_sent[size_bin]
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, best_ndx
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, sn->sample_tt[size_bin]
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, sn->packets_since_sample[size_bin]
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);
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if (!sn->packets_sent[size_bin]) {
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/* no packets sent */
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if (best_ndx == -1) {
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ndx = sn->num_rates - 1;
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if (sc->sc_curmode != IEEE80211_MODE_11B) {
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for (; ndx >= 0 && sn->rates[ndx].rate > 72; ndx--)
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;
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}
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} else {
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ndx = best_ndx;
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}
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} else if (best_ndx == -1) {
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/* no packet has succeeded yet */
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if (mrr) {
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/*
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* no packet has succeeded, try the
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* highest bitrate that hasn't failed
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*/
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for (ndx = sn->num_rates-1; ndx >= 0; ndx--) {
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if (sn->stats[size_bin][ndx].successive_failures == 0) {
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break;
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}
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}
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} else {
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ndx = sn->num_rates - 1;
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if (sc->sc_curmode != IEEE80211_MODE_11B) {
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for (; ndx >= 0 && sn->rates[ndx].rate > 72; ndx--)
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;
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}
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}
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} else if (sn->sample_tt[size_bin] < (sn->packets_since_sample[size_bin]*ssc->ath_sample_rate/100) * average_tx_time &&
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sn->packets_since_sample[size_bin] > 15) {
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if (sn->sample_tt[size_bin] < average_tx_time * (sn->packets_since_sample[size_bin]*ssc->ath_sample_rate/100)) {
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/*
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* we want to limit the time measuring the performance
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* of other bit-rates to ath_sample_rate% of the
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@ -314,13 +298,6 @@ ath_rate_findrate(struct ath_softc *sc, struct ath_node *an,
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*/
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ndx = pick_sample_ndx(sn, size_bin);
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if (ndx != sn->current_rate[size_bin]) {
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DPRINTF(sc, "%s: %s size %d last sample tt %d sampling %d packets since %d\n",
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__func__,
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ether_sprintf(an->an_node.ni_macaddr),
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packet_size_bins[size_bin],
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sn->sample_tt[size_bin],
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sn->rates[ndx].rate,
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sn->packets_since_sample[size_bin]);
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sn->current_sample_ndx[size_bin] = ndx;
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} else {
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sn->current_sample_ndx[size_bin] = -1;
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@ -328,19 +305,37 @@ ath_rate_findrate(struct ath_softc *sc, struct ath_node *an,
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sn->packets_since_sample[size_bin] = 0;
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} else {
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change_rates = 0;
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if (!sn->packets_sent[size_bin] || best_ndx == -1) {
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/* no packet has been sent successfully yet */
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for (ndx = sn->num_rates-1; ndx > 0; ndx--) {
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/*
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* pick the highest rate <= 36 Mbps
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* that hasn't failed.
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*/
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if (sn->rates[ndx].rate <= 72 &&
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sn->stats[size_bin][ndx].successive_failures == 0) {
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break;
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}
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}
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change_rates = 1;
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best_ndx = ndx;
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} else if (sn->packets_sent[size_bin] < 20) {
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/* let the bit-rate switch quickly during the first few packets */
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change_rates = 1;
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} else if (ticks - ((hz*MIN_SWITCH_MS)/1000) > sn->ticks_since_switch[size_bin]) {
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/* 2 seconds have gone by */
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change_rates = 1;
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} else if (average_tx_time * 2 < sn->stats[size_bin][sn->current_rate[size_bin]].average_tx_time) {
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/* the current bit-rate is twice as slow as the best one */
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change_rates = 1;
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}
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sn->packets_since_sample[size_bin]++;
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/*
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* don't switch bit-rates every packet. only
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* switch during the first few packets we send
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* or after 100 packets, or if the current
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* bit-rate begins to perform twice as bad as
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* another one.
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*/
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if (sn->packets_sent[size_bin] < 20 ||
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ticks - ((hz*2000)/1000) > sn->jiffies_since_switch[size_bin] ||
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average_tx_time * 2 < sn->stats[size_bin][sn->current_rate[size_bin]].average_tx_time ) {
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if (sn->packets_sent[size_bin] > 20) {
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DPRINTF(sc, "%s: %s size %d switch rate %d (%d/%d) -> %d (%d/%d) after %d packets mmr %d\n",
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if (change_rates) {
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if (best_ndx != sn->current_rate[size_bin]) {
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DPRINTF(sc, "%s: %s size %d switch rate %d (%d/%d) -> %d (%d/%d) after %d packets mrr %d\n",
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__func__,
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ether_sprintf(an->an_node.ni_macaddr),
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packet_size_bins[size_bin],
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@ -355,17 +350,22 @@ ath_rate_findrate(struct ath_softc *sc, struct ath_node *an,
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}
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sn->packets_since_switch[size_bin] = 0;
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sn->current_rate[size_bin] = best_ndx;
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sn->jiffies_since_switch[size_bin] = ticks;
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sn->ticks_since_switch[size_bin] = ticks;
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}
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ndx = sn->current_rate[size_bin];
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sn->packets_since_switch[size_bin]++;
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if (size_bin == 0) {
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/*
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* set the visible txrate for this node
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* to the rate of small packets
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*/
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an->an_node.ni_txrate = ndx;
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}
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}
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}
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if (ndx < 0) {
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ndx = 0;
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}
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KASSERT(ndx >= 0 && ndx < sn->num_rates, ("ndx is %d", ndx));
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*rix = sn->rates[ndx].rix;
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if (shortPreamble) {
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*txrate = sn->rates[ndx].shortPreambleRateCode;
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@ -373,7 +373,6 @@ ath_rate_findrate(struct ath_softc *sc, struct ath_node *an,
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*txrate = sn->rates[ndx].rateCode;
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}
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sn->packets_sent[size_bin]++;
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an->an_node.ni_txrate = ndx;
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}
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void
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@ -382,28 +381,17 @@ ath_rate_setupxtxdesc(struct ath_softc *sc, struct ath_node *an,
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{
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struct sample_node *sn = ATH_NODE_SAMPLE(an);
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int rateCode = -1;
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int frame_size, size_bin, best_ndx, ndx;
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int frame_size = 0;
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int size_bin = 0;
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int ndx = 0;
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frame_size = ds->ds_ctl0 & 0x0fff; /* low-order 12 bits of ds_ctl0 */
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KASSERT(frame_size != 0, ("no frame size"));
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size_bin = size_to_bin(frame_size);
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best_ndx = best_rate_ndx(sn, size_bin, 0);
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if (best_ndx == -1 || !sn->stats[size_bin][best_ndx].packets_acked) {
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/*
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* no packet has succeeded, so also try at the
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* lowest bitate.
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*/
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ndx = 0;
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} else {
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/*
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* we're trying a different bit-rate, and it could be lossy,
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* so if it fails try at the best bit-rate.
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*/
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ndx = best_ndx;
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size_bin = size_to_bin(frame_size); // TODO: it's correct that frame_size alway 0 ?
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ndx = sn->current_rate[size_bin]; /* retry at the current bit-rate */
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if (!sn->stats[size_bin][ndx].packets_acked) {
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ndx = 0; /* use the lowest bit-rate */
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}
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KASSERT(0 <= ndx && ndx < IEEE80211_RATE_MAXSIZE,
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("invalid ndx %d", ndx));
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if (shortPreamble) {
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rateCode = sn->rates[ndx].shortPreambleRateCode;
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} else {
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@ -461,17 +449,6 @@ update_stats(struct ath_softc *sc, struct ath_node *an,
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short_tries-1,
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MIN(tries3 + tries_so_far, tries) - tries_so_far - 1);
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}
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#ifdef SAMPLE_DEBUG
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if (short_tries + tries > 3 || status) {
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DPRINTF(sc, "%s: %s size %d rate %d ndx %d tries (%d/%d) tries0 %d tt %d avg_tt %d perfect_tt %d status %d\n",
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__func__, ether_sprintf(an->an_node.ni_macaddr),
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size,
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rate, ndx0, short_tries, tries, tries0, tt,
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sn->stats[size_bin][ndx0].average_tx_time,
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sn->stats[size_bin][ndx0].perfect_tx_time,
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status);
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}
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#endif /* SAMPLE_DEBUG */
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if (sn->stats[size_bin][ndx0].total_packets < (100 / (100 - ssc->ath_smoothing_rate))) {
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/* just average the first few packets */
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int avg_tx = sn->stats[size_bin][ndx0].average_tx_time;
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@ -485,16 +462,17 @@ update_stats(struct ath_softc *sc, struct ath_node *an,
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}
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if (status) {
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/*
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* this packet failed - count this as a failure
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* for larger packets also, since we assume
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* if a small packet fails at a lower bit-rate
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* then a larger one will also.
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*/
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int y;
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for (y = size_bin; y < NUM_PACKET_SIZE_BINS; y++) {
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sn->stats[size_bin][ndx0].successive_failures++;
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for (y = size_bin+1; y < NUM_PACKET_SIZE_BINS; y++) {
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/* also say larger packets failed since we
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* assume if a small packet fails at a lower
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* bit-rate then a larger one will also.
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*/
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sn->stats[y][ndx0].successive_failures++;
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sn->stats[y][ndx0].last_tx = ticks;
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sn->stats[y][ndx0].tries += tries;
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sn->stats[y][ndx0].total_packets++;
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}
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} else {
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sn->stats[size_bin][ndx0].packets_acked++;
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@ -521,10 +499,12 @@ void
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ath_rate_tx_complete(struct ath_softc *sc, struct ath_node *an,
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const struct ath_desc *ds, const struct ath_desc *ds0)
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{
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struct ieee80211com *ic = &sc->sc_ic;
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struct sample_node *sn = ATH_NODE_SAMPLE(an);
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const struct ar5212_desc *ads = (const struct ar5212_desc *)&ds->ds_ctl0;
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int final_rate, short_tries, long_tries, frame_size;
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int ndx = -1;
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int mrr;
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final_rate = sc->sc_hwmap[ds->ds_txstat.ts_rate &~ HAL_TXSTAT_ALTRATE].ieeerate;
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short_tries = ds->ds_txstat.ts_shortretry + 1;
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@ -543,6 +523,8 @@ ath_rate_tx_complete(struct ath_softc *sc, struct ath_node *an,
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return;
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}
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mrr = sc->sc_mrretry && !(ic->ic_flags & IEEE80211_F_USEPROT);
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|
||||
if (sc->sc_mrretry && ds->ds_txstat.ts_status) {
|
||||
/* this packet failed */
|
||||
DPRINTF(sc, "%s: %s size %d rate/try %d/%d %d/%d %d/%d %d/%d status %s retries (%d/%d)\n",
|
||||
@ -562,7 +544,7 @@ ath_rate_tx_complete(struct ath_softc *sc, struct ath_node *an,
|
||||
long_tries);
|
||||
}
|
||||
|
||||
if (!(ds->ds_txstat.ts_rate & HAL_TXSTAT_ALTRATE)) {
|
||||
if (!mrr || !(ds->ds_txstat.ts_rate & HAL_TXSTAT_ALTRATE)) {
|
||||
/* only one rate was used */
|
||||
ndx = rate_to_ndx(sn, final_rate);
|
||||
DPRINTF(sc, "%s: %s size %d status %d rate/try %d/%d/%d\n",
|
||||
@ -625,7 +607,7 @@ ath_rate_tx_complete(struct ath_softc *sc, struct ath_node *an,
|
||||
ndx2, tries2,
|
||||
ndx3, tries3,
|
||||
short_tries, ds->ds_txstat.ts_longretry + 1,
|
||||
ds->ds_txstat.ts_status);
|
||||
long_tries > tries0);
|
||||
}
|
||||
|
||||
if (tries1 && finalTSIdx > 0) {
|
||||
@ -732,6 +714,7 @@ ath_rate_ctl_reset(struct ath_softc *sc, struct ieee80211_node *ni)
|
||||
|
||||
for (y = 0; y < NUM_PACKET_SIZE_BINS; y++) {
|
||||
int size = bin_to_size(y);
|
||||
int ndx = 0;
|
||||
sn->packets_sent[y] = 0;
|
||||
sn->current_sample_ndx[y] = -1;
|
||||
sn->last_sample_ndx[y] = 0;
|
||||
@ -749,7 +732,27 @@ ath_rate_ctl_reset(struct ath_softc *sc, struct ieee80211_node *ni)
|
||||
0, 0);
|
||||
sn->stats[y][x].average_tx_time = sn->stats[y][x].perfect_tx_time;
|
||||
}
|
||||
|
||||
/* set the initial rate */
|
||||
for (ndx = sn->num_rates-1; ndx > 0; ndx--) {
|
||||
if (sn->rates[ndx].rate <= 72) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
sn->current_rate[y] = ndx;
|
||||
}
|
||||
|
||||
DPRINTF(sc, "%s: %s %d rates %d%sMbps (%dus)- %d%sMbps (%dus)\n",
|
||||
__func__, ether_sprintf(ni->ni_macaddr),
|
||||
sn->num_rates,
|
||||
sn->rates[0].rate/2, sn->rates[0].rate % 0x1 ? ".5" : "",
|
||||
sn->stats[1][0].perfect_tx_time,
|
||||
sn->rates[sn->num_rates-1].rate/2,
|
||||
sn->rates[sn->num_rates-1].rate % 0x1 ? ".5" : "",
|
||||
sn->stats[1][sn->num_rates-1].perfect_tx_time
|
||||
);
|
||||
|
||||
ni->ni_txrate = sn->current_rate[0];
|
||||
#undef RATE
|
||||
}
|
||||
|
||||
|
||||
@ -90,7 +90,7 @@ struct sample_node {
|
||||
|
||||
int current_rate[NUM_PACKET_SIZE_BINS];
|
||||
int packets_since_switch[NUM_PACKET_SIZE_BINS];
|
||||
unsigned jiffies_since_switch[NUM_PACKET_SIZE_BINS];
|
||||
unsigned ticks_since_switch[NUM_PACKET_SIZE_BINS];
|
||||
|
||||
int packets_since_sample[NUM_PACKET_SIZE_BINS];
|
||||
unsigned sample_tt[NUM_PACKET_SIZE_BINS];
|
||||
@ -186,8 +186,8 @@ static unsigned calc_usecs_unicast_packet(struct ath_softc *sc,
|
||||
int length,
|
||||
int rix, int short_retries, int long_retries) {
|
||||
const HAL_RATE_TABLE *rt = sc->sc_currates;
|
||||
int rts, cts;
|
||||
|
||||
/* pg 205 ieee.802.11.pdf */
|
||||
unsigned t_slot = 20;
|
||||
unsigned t_difs = 50;
|
||||
unsigned t_sifs = 10;
|
||||
@ -196,16 +196,43 @@ static unsigned calc_usecs_unicast_packet(struct ath_softc *sc,
|
||||
int x = 0;
|
||||
int cw = WIFI_CW_MIN;
|
||||
int cix = rt->info[rix].controlRate;
|
||||
int rts = 0;
|
||||
int cts = 0;
|
||||
|
||||
KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
|
||||
|
||||
if (rt->info[rix].phy == IEEE80211_T_OFDM) {
|
||||
t_slot = 9;
|
||||
t_sifs = 9;
|
||||
t_difs = 28;
|
||||
if (!rt->info[rix].rateKbps) {
|
||||
printf("rix %d (%d) bad ratekbps %d mode %u",
|
||||
rix, rt->info[rix].dot11Rate,
|
||||
rt->info[rix].rateKbps,
|
||||
sc->sc_curmode);
|
||||
|
||||
return 0;
|
||||
}
|
||||
/*
|
||||
* XXX getting mac/phy level timings should be fixed for turbo
|
||||
* rates, and there is probably a way to get this from the
|
||||
* hal...
|
||||
*/
|
||||
switch (rt->info[rix].phy) {
|
||||
case IEEE80211_T_OFDM:
|
||||
t_slot = 9;
|
||||
t_sifs = 16;
|
||||
t_difs = 28;
|
||||
/* fall through */
|
||||
case IEEE80211_T_TURBO:
|
||||
t_slot = 9;
|
||||
t_sifs = 8;
|
||||
t_difs = 28;
|
||||
break;
|
||||
case IEEE80211_T_DS:
|
||||
/* fall through to default */
|
||||
default:
|
||||
/* pg 205 ieee.802.11.pdf */
|
||||
t_slot = 20;
|
||||
t_difs = 50;
|
||||
t_sifs = 10;
|
||||
}
|
||||
|
||||
rts = cts = 0;
|
||||
|
||||
if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
|
||||
rt->info[rix].phy == IEEE80211_T_OFDM) {
|
||||
@ -218,13 +245,22 @@ static unsigned calc_usecs_unicast_packet(struct ath_softc *sc,
|
||||
|
||||
}
|
||||
|
||||
if (length > ic->ic_rtsthreshold) {
|
||||
if (0 /*length > ic->ic_rtsthreshold */) {
|
||||
rts = 1;
|
||||
}
|
||||
|
||||
if (rts || cts) {
|
||||
int ctsrate = rt->info[cix].rateCode;
|
||||
int ctsduration = 0;
|
||||
|
||||
if (!rt->info[cix].rateKbps) {
|
||||
printf("cix %d (%d) bad ratekbps %d mode %u",
|
||||
cix, rt->info[cix].dot11Rate,
|
||||
rt->info[cix].rateKbps,
|
||||
sc->sc_curmode);
|
||||
return 0;
|
||||
}
|
||||
|
||||
ctsrate |= rt->info[cix].shortPreamble;
|
||||
if (rts) /* SIFS + CTS */
|
||||
ctsduration += rt->info[cix].spAckDuration;
|
||||
@ -238,7 +274,7 @@ static unsigned calc_usecs_unicast_packet(struct ath_softc *sc,
|
||||
tt += (short_retries + 1) * ctsduration;
|
||||
}
|
||||
tt += t_difs;
|
||||
tt += (long_retries+1)*(t_sifs + rt->info[cix].spAckDuration);
|
||||
tt += (long_retries+1)*(t_sifs + rt->info[rix].spAckDuration);
|
||||
tt += (long_retries+1)*ath_hal_computetxtime(sc->sc_ah, rt, length,
|
||||
rix, AH_TRUE);
|
||||
for (x = 0; x <= short_retries + long_retries; x++) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user