[Xen-devel] Re: performance regression from c/s 21647:cfba1560054a

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 10.11.11 at 16:16, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
wrote:
> On Thu, 10 Nov 2011, Jan Beulich wrote:
>> >>> On 10.11.11 at 15:59, Stefano Stabellini 
>> >>> <stefano.stabellini@xxxxxxxxxxxxx>
>> wrote:
>> > On Thu, 10 Nov 2011, Jan Beulich wrote:
>> >> It's SLE11 SP1 guests that suffered a regression after a maintenance
>> >> update (originally shipped with 4.0.0, while that patch got backported
>> >> later into 4.0.x).
>> > 
>> > Is SLES11 SP1 using HVMOP_pagetable_dying (see
>> > arch/x86/xen/mmu.c:xen_hvm_init_mmu_ops)?
>> 
>> No, it's not.
>  
> well, it should, not to fix this problem but because it is a significant
> performance improvement when running on shadow

Well - if you have suggestions on how to do this (a) in 2.6.32.x, (b)
without turning on CONFIG_XEN, and (c) without massive patching,
them I'm all for it.

Jan


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