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Re: [Xen-users] Xen 4.1 and 3.0 kernel CPU performance

On Sat, Oct 15, 2011 at 4:21 AM, Kommeri Jukka <jukka.kommeri@xxxxxxxx> wrote:
> Hello all,
> I have been running different benchmarks on paravirtualized domU. I have run
> into strange performance drops with CPU intesive benchmarks (64-bit
> BurnInSSE & 64-bit Linpack test).
> With Linpack test the performance of Xen is 90% of hardware where KVM is
> only about 1-2% worse than hardware. This is something new to me as I am
> used to better performance with older Xen versions.

Linux 3.0 is not performance optimized yet. There are some known bugs.
Many of which are fixed in newer versions.

See: http://wiki.xen.org/xenwiki/Linux_30_bugs

For more hints on tweaking things see:

Can you provide us with more details of your setup so that we can give
you more suggestions?

It would be better to be testing the newest Linux kernel, since a lot
of changes have gone in since Linux 3.0

> I have a Dell R410 with two Xeon E5520 processors and I am running Ubuntu
> Lucid on both domU and dom0. The Xen settings are pretty much default,
> though I did try varying credit scheduler weights without any success.
> Has anybody else noticed the same or have I just forgot something essential
> from my kernel?
> Best regards,
> Jukka Kommeri
> _______________________________________________
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> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users

Todd Deshane

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