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iflib: Relax timer period from 0.5 to 0.5-0.75s.

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While there switch it from hardclock ticks to milliseconds.

MFC after:	2 weeks
This commit is contained in:
Alexander Motin 2022-01-09 20:32:50 -05:00
parent cb1f5d1136
commit 90bc1cf657
1 changed files with 26 additions and 28 deletions
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54
sys/net/iflib.c
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@ -337,7 +337,6 @@ struct iflib_txq {
uint64_t ift_map_failed;
uint64_t ift_txd_encap_efbig;
uint64_t ift_pullups;
uint64_t ift_last_timer_tick;
struct mtx ift_mtx;
struct mtx ift_db_mtx;
@ -587,9 +586,9 @@ SYSCTL_INT(_net_iflib, OID_AUTO, min_tx_latency, CTLFLAG_RW,
static int iflib_no_tx_batch = 0;
SYSCTL_INT(_net_iflib, OID_AUTO, no_tx_batch, CTLFLAG_RW,
&iflib_no_tx_batch, 0, "minimize transmit latency at the possible expense of throughput");
static int iflib_timer_default = 1000;
SYSCTL_INT(_net_iflib, OID_AUTO, timer_default, CTLFLAG_RW,
&iflib_timer_default, 0, "number of ticks between iflib_timer calls");
static int iflib_timer_period = 500;
SYSCTL_INT(_net_iflib, OID_AUTO, timer_period, CTLFLAG_RW,
&iflib_timer_period, 0, "milliseconds between iflib_timer calls");
#if IFLIB_DEBUG_COUNTERS
@ -2393,7 +2392,6 @@ iflib_timer(void *arg)
iflib_txq_t txq = arg;
if_ctx_t ctx = txq->ift_ctx;
if_softc_ctx_t sctx = &ctx->ifc_softc_ctx;
uint64_t this_tick = ticks;
if (!(if_getdrvflags(ctx->ifc_ifp) & IFF_DRV_RUNNING))
return;
@ -2403,30 +2401,28 @@ iflib_timer(void *arg)
** can be done without the lock because its RO
** and the HUNG state will be static if set.
*/
if (this_tick - txq->ift_last_timer_tick >= iflib_timer_default) {
txq->ift_last_timer_tick = this_tick;
IFDI_TIMER(ctx, txq->ift_id);
if ((txq->ift_qstatus == IFLIB_QUEUE_HUNG) &&
((txq->ift_cleaned_prev == txq->ift_cleaned) ||
(sctx->isc_pause_frames == 0)))
goto hung;
if (txq->ift_qstatus != IFLIB_QUEUE_IDLE &&
ifmp_ring_is_stalled(txq->ift_br)) {
KASSERT(ctx->ifc_link_state == LINK_STATE_UP,
("queue can't be marked as hung if interface is down"));
txq->ift_qstatus = IFLIB_QUEUE_HUNG;
}
txq->ift_cleaned_prev = txq->ift_cleaned;
IFDI_TIMER(ctx, txq->ift_id);
if ((txq->ift_qstatus == IFLIB_QUEUE_HUNG) &&
((txq->ift_cleaned_prev == txq->ift_cleaned) ||
(sctx->isc_pause_frames == 0)))
goto hung;
if (txq->ift_qstatus != IFLIB_QUEUE_IDLE &&
ifmp_ring_is_stalled(txq->ift_br)) {
KASSERT(ctx->ifc_link_state == LINK_STATE_UP,
("queue can't be marked as hung if interface is down"));
txq->ift_qstatus = IFLIB_QUEUE_HUNG;
}
txq->ift_cleaned_prev = txq->ift_cleaned;
/* handle any laggards */
if (txq->ift_db_pending)
GROUPTASK_ENQUEUE(&txq->ift_task);
sctx->isc_pause_frames = 0;
if (if_getdrvflags(ctx->ifc_ifp) & IFF_DRV_RUNNING)
callout_reset_on(&txq->ift_timer, iflib_timer_default, iflib_timer,
txq, txq->ift_timer.c_cpu);
if (if_getdrvflags(ctx->ifc_ifp) & IFF_DRV_RUNNING)
callout_reset_sbt_on(&txq->ift_timer,
iflib_timer_period * SBT_1MS, 0,
iflib_timer, txq, txq->ift_timer.c_cpu, C_PREL(1));
return;
hung:
@ -2544,8 +2540,9 @@ iflib_init_locked(if_ctx_t ctx)
IFDI_INTR_ENABLE(ctx);
txq = ctx->ifc_txqs;
for (i = 0; i < sctx->isc_ntxqsets; i++, txq++)
callout_reset_on(&txq->ift_timer, iflib_timer_default, iflib_timer, txq,
txq->ift_timer.c_cpu);
callout_reset_sbt_on(&txq->ift_timer,
iflib_timer_period * SBT_1MS, 0,
iflib_timer, txq, txq->ift_timer.c_cpu, C_PREL(1));
/* Re-enable txsync/rxsync. */
netmap_enable_all_rings(ifp);
@ -4067,8 +4064,9 @@ _task_fn_admin(void *context)
}
IFDI_UPDATE_ADMIN_STATUS(ctx);
for (txq = ctx->ifc_txqs, i = 0; i < sctx->isc_ntxqsets; i++, txq++) {
callout_reset_on(&txq->ift_timer, iflib_timer_default, iflib_timer, txq,
txq->ift_timer.c_cpu);
callout_reset_sbt_on(&txq->ift_timer,
iflib_timer_period * SBT_1MS, 0,
iflib_timer, txq, txq->ift_timer.c_cpu, C_PREL(1));
}
IFDI_LINK_INTR_ENABLE(ctx);
if (do_reset)
@ -5721,7 +5719,7 @@ iflib_device_iov_add_vf(device_t dev, uint16_t vfnum, const nvlist_t *params)
static int
iflib_module_init(void)
{
iflib_timer_default = hz / 2;
return (0);
}