Messages in this thread | | | Date | Fri, 04 Jan 2013 13:49:10 -0800 (PST) | Subject | Re: [PATCH v2 net-next] softirq: reduce latencies | From | David Miller <> |
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From: Eric Dumazet <eric.dumazet@gmail.com> Date: Thu, 03 Jan 2013 23:49:40 -0800
> From: Eric Dumazet <edumazet@google.com> > > In various network workloads, __do_softirq() latencies can be up > to 20 ms if HZ=1000, and 200 ms if HZ=100. > > This is because we iterate 10 times in the softirq dispatcher, > and some actions can consume a lot of cycles. > > This patch changes the fallback to ksoftirqd condition to : > > - A time limit of 2 ms. > - need_resched() being set on current task > > When one of this condition is met, we wakeup ksoftirqd for further > softirq processing if we still have pending softirqs. ... > Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: David S. Miller <davem@davemloft.net>
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