netdev - Re: TCPBacklogDrops during aggressive bursts of traffic

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Message-Id: <20120523.135727.414815976542132549.davem@davemloft.net>
Date:	Wed, 23 May 2012 13:57:27 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	kmansley@...arflare.com, bhutchings@...arflare.com,
	netdev@...r.kernel.org
Subject: Re: TCPBacklogDrops during aggressive bursts of traffic

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 23 May 2012 19:46:50 +0200

> 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().

These arguments seem circular.

Those modern applications still trigger enough TCP work during their
recv() calls that it's significant enough for scheduling purposes, and
to me being able to account that TCP work as process time is still
extremely beneficial.
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