Re: [Xen-devel] 4.1.2 very slow without upstream patches, but fast with them, also 4.2 very slow

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

On Mon, Aug 06, 2012 at 01:41:07PM +0100, Malcolm Crossley wrote:
> On 06/08/12 11:12, Peter Maloney wrote:
> >my AMD FX-8150 system with vanilla source code is super slow, both the
> >dom0 and domUs. However, after I merge the upstream patches I found in
> >the openSUSE rpm, it runs normally.
> >
> >I tried 4.2-unstable and it was the same. There was no rc1 when I tested
> >it about 1.5 weeks ago. And 4.2 has the same horrible performance, and
> >obviously those patches won't work any more since the 4.2 code looks
> >completely reorganized, so I'm stuck with 4.1.2
> >
> >Here is the rpm I was using at the time:
> >http://download.opensuse.org/update/12.1/src/xen-4.1.2_16-1.7.1.src.rpm
> >
> >To see the list of the patches and what order to apply them, see the
> >spec file.
> >
> >Please make sure this performance issue is fixed for the 4.2 release.
> >And I would be happy to test whatever files you send me.
> >
> >
> >
> >_______________________________________________
> >Xen-devel mailing list
> >Xen-devel@xxxxxxxxxxxxx
> >http://lists.xen.org/xen-devel
> I suspect you may need the following patch to improve your 4.1.2
> performance:
> 
> http://xenbits.xen.org/hg/xen-4.1-testing.hg/rev/435493696053
> 
> The cache flush on every C2 transition is very expensive and causes
> a large slow down.
> 
> 4.1.3-rc3 already includes that patch so it would be worth testing
> that version.

MA Young, could this be back-ported in the F17 and F16. I belive
Micahel Petullo setup a bug for that?

> 
> Malcolm
> 
> 
> 
> 
> 
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