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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 10.11.11 at 16:00, Gianluca Guida <glguida@xxxxxxxxx> wrote:
> On Thu, Nov 10, 2011 at 6:59 AM, 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)?
> 
> Good question. In case it does not, just changing the ">l1" check to
> work only in case we used the hypercall might do the trick.

Possibly, though I would argue that the difference between Linuxes
shouldn't be that big (i.e. I would rather expect that pv-on-hvm
guests also see a performance penalty here).

Jan


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