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Reorder the TCP header prediction test to check for the most volatile

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values first to spend less time on a fallback to normal processing.
This commit is contained in:
Andre Oppermann 2007-05-06 15:23:51 +00:00
parent 679d9708b6
commit c5ad39b910
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=169315
2 changed files with 12 additions and 8 deletions
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10
sys/netinet/tcp_input.c
View File

@ -1113,16 +1113,18 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
* (the reassembly queue is empty), add the data to
* the socket buffer and note that we need a delayed ack.
* Make sure that the hidden state-flags are also off.
* Since we check for TCPS_ESTABLISHED above, it can only
* Since we check for TCPS_ESTABLISHED first, it can only
* be TH_NEEDSYN.
*/
if (tp->t_state == TCPS_ESTABLISHED &&
th->th_seq == tp->rcv_nxt &&
(thflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) == TH_ACK &&
tp->snd_nxt == tp->snd_max &&
tiwin && tiwin == tp->snd_wnd &&
((tp->t_flags & (TF_NEEDSYN|TF_NEEDFIN)) == 0) &&
LIST_EMPTY(&tp->t_segq) &&
((to.to_flags & TOF_TS) == 0 ||
TSTMP_GEQ(to.to_tsval, tp->ts_recent)) &&
th->th_seq == tp->rcv_nxt && tiwin && tiwin == tp->snd_wnd &&
tp->snd_nxt == tp->snd_max) {
TSTMP_GEQ(to.to_tsval, tp->ts_recent)) ) {
/*
* If last ACK falls within this segment's sequence numbers,

10
sys/netinet/tcp_reass.c
View File

@ -1113,16 +1113,18 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
* (the reassembly queue is empty), add the data to
* the socket buffer and note that we need a delayed ack.
* Make sure that the hidden state-flags are also off.
* Since we check for TCPS_ESTABLISHED above, it can only
* Since we check for TCPS_ESTABLISHED first, it can only
* be TH_NEEDSYN.
*/
if (tp->t_state == TCPS_ESTABLISHED &&
th->th_seq == tp->rcv_nxt &&
(thflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) == TH_ACK &&
tp->snd_nxt == tp->snd_max &&
tiwin && tiwin == tp->snd_wnd &&
((tp->t_flags & (TF_NEEDSYN|TF_NEEDFIN)) == 0) &&
LIST_EMPTY(&tp->t_segq) &&
((to.to_flags & TOF_TS) == 0 ||
TSTMP_GEQ(to.to_tsval, tp->ts_recent)) &&
th->th_seq == tp->rcv_nxt && tiwin && tiwin == tp->snd_wnd &&
tp->snd_nxt == tp->snd_max) {
TSTMP_GEQ(to.to_tsval, tp->ts_recent)) ) {
/*
* If last ACK falls within this segment's sequence numbers,