Re: 4.1.2 very slow without upstream patches, but fast with them, also 4.2 very slow

[Malcolm Crossley <malcolm.crossley@citrix.com>]

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.
>
>
>
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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.

Malcolm