Re: Poor performance with Linux 3.x as dom0

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Thu, May 03, 2012 at 11:51:57AM +0100, Ian Campbell wrote:
> On Thu, 2012-05-03 at 11:43 +0100, Andreas Kinzler wrote:
> > On 02.05.2012 15:31, Ian Campbell wrote:
> > > Did you happen to also compare 3.2.12 and 2.6.34.10 running these
> > > workloads natively?
> > 
> > Yes, I tested against 2.6.32.x. Differences exist, but are minor.
> 
> Good to know, thanks for testing
> 
> The other potential Xen perf thing which just occurred to to me is the
> ACPI power management stuff which the xen-acpi-processor patches in
> 3.4-rcN are fixing. These are necessary to enable things like turbo mode
> so have a pretty large perf impact.
> 
> Are you able to try the latest 3.4-rc kernel?
> 
> I'm not sure if backports to the kernels you are running exist or not,
> Konrad? 

No. But they should be easy to cherry-pick. However, I would suggest
trying v3.4-rc6 first and seeing if that makes a difference.

> 
> Ian.