netdev - Re: 16% regression on 10G caused by TCP small queues

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Message-ID: <20131023214557.386aad1a@nehalam.linuxnetplumber.net>
Date:	Wed, 23 Oct 2013 21:45:57 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	David Miller <davem@...emloft.net>
Cc:	ncardwell@...gle.com, eric.dumazet@...il.com,
	dave.taht@...ferbloat.net, netdev@...r.kernel.org
Subject: Re: 16% regression on 10G caused by TCP small queues

On Wed, 23 Oct 2013 23:38:16 -0400 (EDT)
David Miller <davem@...emloft.net> wrote:

> From: Stephen Hemminger <stephen@...workplumber.org>
> Date: Wed, 23 Oct 2013 20:09:49 -0700
> 
> > I will check 3.12, but what about users on 3.10 which is the LTS
> > kernel used by most distros?

3.12-rc6 gets line rate again (9.41 Gbit/sec)

> The fix will be backported to -stable, relax Stephen.

Sorry, thought sk_pacing_rate depended on FQ qdisc but it is other way around.
In which case doing merge of these two was sufficient to fix the problem.
With a minor manual fix up to tcp.h.


commit 95bd09eb27507691520d39ee1044d6ad831c1168
Author: Eric Dumazet <edumazet@...gle.com>
Date:   Tue Aug 27 05:46:32 2013 -0700

    tcp: TSO packets automatic sizing

commit c9eeec26e32e087359160406f96e0949b3cc6f10
Author: Eric Dumazet <edumazet@...gle.com>
Date:   Fri Sep 27 03:28:54 2013 -0700

    tcp: TSQ can use a dynamic limit
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