From: David Miller <davem@davemloft.net>
To: eric.dumazet@gmail.com
Cc: bhutchings@solarflare.com, akpm@linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
therbert@google.com
Subject: Re: [PATCH v2 net-next] softirq: reduce latencies
Date: Fri, 04 Jan 2013 13:49:10 -0800 (PST) [thread overview]
Message-ID: <20130104.134910.1157297903826332014.davem@davemloft.net> (raw)
In-Reply-To: <1357285780.21409.28416.camel@edumazet-glaptop>
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>
next prev parent reply other threads:[~2013-01-04 21:49 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-03 12:28 [PATCH net-next] softirq: reduce latencies Eric Dumazet
2013-01-03 20:46 ` Andrew Morton
2013-01-03 22:41 ` Eric Dumazet
2013-01-04 5:16 ` Namhyung Kim
2013-01-04 6:53 ` Eric Dumazet
[not found] ` <787701357283699@web24e.yandex.ru>
2013-01-04 7:46 ` Eric Dumazet
2013-01-03 22:08 ` Ben Hutchings
2013-01-03 22:40 ` Eric Dumazet
2013-01-04 7:49 ` [PATCH v2 " Eric Dumazet
2013-01-04 8:15 ` Joe Perches
2013-01-04 8:23 ` Eric Dumazet
2013-01-04 9:12 ` Joe Perches
2013-01-04 17:00 ` Eric Dumazet
2013-01-04 21:15 ` [PATCH] jiffies conversions: Use compile time constants when possible Joe Perches
2013-01-04 21:49 ` David Miller [this message]
-- strict thread matches above, loose matches on Subject: below --
2013-01-05 8:58 [PATCH v2 net-next] softirq: reduce latencies Sedat Dilek
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