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| author | Stephen Hemminger <shemminger@linux-foundation.org> | 2007-03-22 12:18:35 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:27:23 -0700 |
| commit | 1936502d00ae6c2aa3931c42f6cf54afaba094f2 (patch) | |
| tree | 2870f51b8b5a91c39295fe092dd042b774825bf4 /net/sched/sch_api.c | |
| parent | 11274e5a43266d531140530adebead6903380caf (diff) | |
| download | blackbird-obmc-linux-1936502d00ae6c2aa3931c42f6cf54afaba094f2.tar.gz blackbird-obmc-linux-1936502d00ae6c2aa3931c42f6cf54afaba094f2.zip | |
[NET_SCHED] qdisc: avoid transmit softirq on watchdog wakeup
If possible, avoid having to do a transmit softirq when a qdisc
watchdog decides to re-enable. The watchdog routine runs off
a timer, so it is already in the same effective context as
the softirq.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_api.c')
| -rw-r--r-- | net/sched/sch_api.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index fcaa4adefc82..58732509160d 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -296,10 +296,16 @@ static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) { struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, timer); + struct net_device *dev = wd->qdisc->dev; wd->qdisc->flags &= ~TCQ_F_THROTTLED; smp_wmb(); - netif_schedule(wd->qdisc->dev); + if (spin_trylock(&dev->queue_lock)) { + qdisc_run(dev); + spin_unlock(&dev->queue_lock); + } else + netif_schedule(dev); + return HRTIMER_NORESTART; } |
