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authorEric Dumazet <edumazet@google.com>2014-10-04 10:11:31 -0700
committerDavid S. Miller <davem@davemloft.net>2014-10-06 00:55:10 -0400
commitf2600cf02b5b59aaee082c3485b7f01fc7f7b70c (patch)
treef38d692c3f706ead3d0cfd77b216fbd629a22964 /net/sched/sch_tbf.c
parent681d2421e1135b95f5cd9d16fe10eac7f570a9f2 (diff)
downloadlinux-f2600cf02b5b59aaee082c3485b7f01fc7f7b70c.tar.bz2
net: sched: avoid costly atomic operation in fq_dequeue()
Standard qdisc API to setup a timer implies an atomic operation on every packet dequeue : qdisc_unthrottled() It turns out this is not really needed for FQ, as FQ has no concept of global qdisc throttling, being a qdisc handling many different flows, some of them can be throttled, while others are not. Fix is straightforward : add a 'bool throttle' to qdisc_watchdog_schedule_ns(), and remove calls to qdisc_unthrottled() in sch_fq. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_tbf.c')
-rw-r--r--net/sched/sch_tbf.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index 77edffe329c4..a4afde14e865 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -268,7 +268,8 @@ static struct sk_buff *tbf_dequeue(struct Qdisc *sch)
}
qdisc_watchdog_schedule_ns(&q->watchdog,
- now + max_t(long, -toks, -ptoks));
+ now + max_t(long, -toks, -ptoks),
+ true);
/* Maybe we have a shorter packet in the queue,
which can be sent now. It sounds cool,