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

[Konrad Rzeszutek Wilk]

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(a)lists.xen.org
>  >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
>  
>  
>  
>  
>  
>  _______________________________________________
>  Xen-devel mailing list
>  Xen-devel(a)lists.xen.org
>  http://lists.xen.org/xen-devel

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

[M A Young]

On Mon, 6 Aug 2012, Konrad Rzeszutek Wilk wrote:
>  On Mon, Aug 06, 2012 at 01:41:07PM +0100, Malcolm Crossley wrote:
> > 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? 
I don't recall I seeing a bug for this but the patch is in 
xen-4.1.2-25.fc18 and xen-4.1.2-25.fc17 (which is building now).

 	Michael Young

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

[W. Michael Petullo]

> >> 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? 
 
>  I don't recall I seeing a bug for this but the patch is in
>  xen-4.1.2-25.fc18 and xen-4.1.2-25.fc17 (which is building now). 
The performance-related bug I filed is at:

https://bugzilla.redhat.com/show_bug.cgi?id=841330

-- 
Mike

:wq