netdev - Re: Performance degradation on 2.6.25 kernels for http servers

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Date:	Wed, 23 Jul 2008 23:20:47 +0200
From:	"Tobias Koeck" <tobias.koeck@...il.com>
To:	"Ben Greear" <greearb@...delatech.com>
Cc:	NetDev <netdev@...r.kernel.org>
Subject: Re: Performance degradation on 2.6.25 kernels for http servers

Do you have the same configuration?

2008/7/23 Ben Greear <greearb@...delatech.com>:
> We noticed something strange today.
>
> We have a test that launches 10 http clients that request a small
> URL over and over again.  Keep-alive is enabled on clients and
> apache.
>
> When using a 2.6.24 or earlier kernel on the web server, we get around
> 1200 urls per second completed on each of the 10 clients.  With 2.6.25
> kernel
> we get around 1000 urls per second completed.  In other words, about
> a 20% degradation in connections per second.
>
> We see the same affect when we use standard Fedora kernels as when
> we use our own patched kernels.  We see similar degradations when using
> FC5 and FC8, and 32-bit and 64-bit installs.  We see similar degradations
> on different hardware systems.  We have only tried our modified kernels
> and standard Fedora kernels at this time (no un-modified kernels from
> kernel.org).
>
> It could still be something we are doing wrong, but if anyone
> else has a similar test case, I'm curious to know if you see
> similar degradations.
>
> Thanks,
> Ben
>
> --
> Ben Greear <greearb@...delatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>
> --
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