netdev - Re: big picture UDP/IP performance question re 2.6.18 -> 2.6.32

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Message-Id: <6.2.5.6.2.20111001141002.05af4b20@binnacle.cx>
Date:	Sat, 01 Oct 2011 14:16:05 -0400
From:	starlight@...nacle.cx
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: big picture UDP/IP performance question re 2.6.18
  -> 2.6.32

At 08:44 AM 10/1/2011 +0200, Eric Dumazet wrote:
>In my experience, I have the exact opposite :
>performance greatly improved in recent
>kernels. Unless you compile your kernel to include
>new features that might reduce performance
>(namespaces, cgroup, ...)

RH has both of the above turned on in the
2.6.32-71.29.1.el6.x86_64 kernel tested.

If these are big negatives to network
performance, could you list what should
specifically turned off to maximize
results?  Also a recommendation for
the best recent kernel for another
benchmark would be helpful.

Probably can't convince anyone to deploy a
kernel without commercial support, but if
an alternate compile fixes performance it
might be possible to convince RH to support
the alternative build.

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