From: Eric Dumazet <eric.dumazet@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: kmansley@solarflare.com, bhutchings@solarflare.com,
netdev@vger.kernel.org
Subject: Re: TCPBacklogDrops during aggressive bursts of traffic
Date: Wed, 23 May 2012 19:46:50 +0200 [thread overview]
Message-ID: <1337795210.3361.3118.camel@edumazet-glaptop> (raw)
In-Reply-To: <20120523.133401.915684077769386834.davem@davemloft.net>
On Wed, 2012-05-23 at 13:34 -0400, David Miller wrote:
> But it is the only way we can have TCP processing scheduled and
> accounted to user processes. That does have value when you have lots
> of flows active.
>
> The scheduler's ability to give the process cpu time influences
> TCP's behavier, and under load if the process can't get enough
> cpu time then TCP will back off. We want that.
But TCP already backs off if user process is not blocked on socket
input.
Modern applications uses select()/poll()/epoll() on many sockets in //.
Only old ones stil block on recv().
next prev parent reply other threads:[~2012-05-23 17:46 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-15 14:38 TCPBacklogDrops during aggressive bursts of traffic Kieran Mansley
2012-05-15 14:56 ` Eric Dumazet
2012-05-15 15:00 ` Eric Dumazet
2012-05-15 16:29 ` Kieran Mansley
2012-05-15 16:34 ` Eric Dumazet
2012-05-15 16:47 ` Ben Hutchings
2012-05-15 17:01 ` Eric Dumazet
2012-05-15 17:23 ` Eric Dumazet
2012-05-17 16:31 ` Kieran Mansley
2012-05-17 16:37 ` Eric Dumazet
2012-05-18 15:45 ` Kieran Mansley
2012-05-18 15:49 ` Eric Dumazet
2012-05-18 15:53 ` Kieran Mansley
2012-05-18 18:40 ` Eric Dumazet
2012-05-22 8:20 ` Kieran Mansley
2012-05-22 9:25 ` Eric Dumazet
2012-05-22 9:30 ` Eric Dumazet
2012-05-22 15:09 ` Kieran Mansley
2012-05-22 16:12 ` Eric Dumazet
2012-05-22 16:32 ` Kieran Mansley
2012-05-22 16:45 ` Eric Dumazet
2012-05-22 20:54 ` Eric Dumazet
2012-05-23 9:44 ` Eric Dumazet
2012-05-23 12:09 ` Eric Dumazet
2012-05-23 16:04 ` Alexander Duyck
2012-05-23 16:12 ` Eric Dumazet
2012-05-23 16:39 ` Eric Dumazet
2012-05-23 17:10 ` Alexander Duyck
2012-05-23 21:19 ` Alexander Duyck
2012-05-23 21:37 ` Eric Dumazet
2012-05-23 22:03 ` Alexander Duyck
2012-05-23 16:58 ` Alexander Duyck
2012-05-23 17:24 ` Eric Dumazet
2012-05-23 17:57 ` Alexander Duyck
2012-05-23 17:34 ` David Miller
2012-05-23 17:46 ` Eric Dumazet [this message]
2012-05-23 17:57 ` David Miller
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