Re: [Xen-devel] performace issue when turn on apicv

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 18.06.15 at 11:18, <yang.z.zhang@xxxxxxxxx> wrote:
> Jan Beulich wrote on 2015-06-18:
>>>>> On 18.06.15 at 10:53, <yang.z.zhang@xxxxxxxxx> wrote:
>>> Jan Beulich wrote on 2015-06-18:
>>>>>>> On 18.06.15 at 10:20, <JBeulich@xxxxxxxx> wrote:
>>>>> Apart from that I notice that the EXIT_REASON_EOI_INDUCED handling
>>>>> also adds about the same number of ticks...
>>>> 
>>>> Are there any other devices in the guest causing meaningful amounts
>>>> of interrupts (I suppose the SSD itself is using just one)? I ask
>>>> since I wonder whether e.g. there may be lock contention in
>> vioapic_update_EOI().
>>> 
>>> The EXIT_REASON_EOI_INDUCED is for local apic time.
>> 
>> ??? (I.e. I don't see the connection between the context and your reply.
>> Perhaps I'm missing something obvious...)
> 
> I mean the lots of EXIT_REASON_EOI_INDUCEDis for local apic time which is 
> edge-trigger. So it will not call vioapic_update_EOI.

Okay, this then suggests the problem being hvm_dpci_msi_eoi(),
albeit looking at it I can't immediately see why it would take long.

Jan


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