From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <dvrabel@cantab.net>
Subject: Re: Poor performance with Linux 3.x as dom0
Date: Wed, 02 May 2012 14:30:48 +0100
Message-ID: <4FA13708.4050202@cantab.net>
References: <4FA1328B.6070602@hfp.de>
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To: Andreas Kinzler <ml-xen-devel@hfp.de>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, xen-devel@lists.xensource.com, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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On 02/05/12 14:11, Andreas Kinzler wrote:
> Hello Jeremy + Konrad + all kernel devs,
> 
> while it is great to see that vanilla dom0 seems to work, the
> performance breakdown compared to xenified 2.6.34 (from opensuse) is
> huge. Here are my benchmarks:
> 
> Xen 4.1.1, Xeon E5620, Supermicro X8DTi-F, 12 GB RAM, dom0 2 VCPUs
> 
> time emerge apache:
> 
>         3.2.12-dom0    3.3.4-dom0    2.6.34.10-dom0
>     real    1m0.560s    0m59.971s    0m47.689s
>     user    0m40.939s    0m40.619s    0m41.355s
>     sys     0m18.865s    0m18.305s    0m11.441s

Can you apply 7eb7ce4d2e8991aff4ecb71a81949a907ca755ac "xen: correctly
check for pending events when restoring irq flags"[1] and see how much
it helps?

This patch is in 3.4-rc5 and is queued for 3.3.5.

David

[1]
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=7eb7ce4d2e8991aff4ecb71a81949a907ca755ac