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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Oct 17, 2011 at 11:33:27AM -0400, Todd Deshane wrote:
> 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).

What happens if you run PVonHVM domU? Meaning you boot the guest as if it
is HVM? This is 3.0 DomU and 3.0 Dom0?

> >
> > 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.

Hmm..
> >
> 
> 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:
> http://wiki.xen.org/xenwiki/XenParavirtOps
> 
> 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

<nods> Did you upgrade Jukka?

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