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