WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

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

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?

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

<Prev in Thread] Current Thread [Next in Thread>