netdev - Re: TCPBacklogDrops during aggressive bursts of traffic

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Message-ID: <1337356176.7029.47.camel@edumazet-glaptop>
Date:	Fri, 18 May 2012 17:49:36 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Kieran Mansley <kmansley@...arflare.com>
Cc:	Ben Hutchings <bhutchings@...arflare.com>, netdev@...r.kernel.org
Subject: Re: TCPBacklogDrops during aggressive bursts of traffic

On Fri, 2012-05-18 at 16:45 +0100, Kieran Mansley wrote:
> On Thu, 2012-05-17 at 18:37 +0200, Eric Dumazet wrote:
> > 
> > Hmm, I was not suggesting running production servers with this
> > setting, only do an experiment.
> 
> OK.  I've found a more reliable way to reproduce it (use MSG_WAITALL to
> make the recv call wait till the socket buffer will be more full) and
> tried with the tcp_adv_win_scale to -2.  It's hard to make any confident
> assertions about the impact of it, but if it does change the behaviour
> it is a small change.  There are certainly still plenty of drops with
> that setting.

Are you playing with SO_RCVBUF, or let the stack autotune it ?


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