Re: [Xen-devel] Poor performance with Linux 3.x as dom0

[Andreas Kinzler <ml-xen-devel@xxxxxx>]

On 03.05.2012 10:32, George Dunlap wrote:
> > > Can you apply 7eb7ce4d2e8991aff4ecb71a81949a907ca755ac "xen: correctly
> > > check for pending events when restoring irq flags"[1] and see how much
> > > it helps?
> > There is some minor improvement - but it is still far away from xenified
> > 2.6.34.10.
> Just FYI, the reason Ian suggested making the same comparison for
> native is that the performance of linux overall on bare-metal has also
> suffered since 2.6.34.  It's likely that a non-trivial amount of the
> performance regression is due to moving from 2.6.34 to 3.{2,3}, over
> and above whatever regressions may have happened when moving from
> xenified to pvops.
I took his suggestion serious - and actually I had performed these tests 
(see my other post). Unfortunately, the minor loss on bare-metal and the 
huge loss on xenified 2.6.34 vs pvops 3.x show that the problem is 
clearly with the Xen changes and not the bare-metal changes.
Regards Andreas

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