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

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

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.

> 
> Jan


Best regards,
Yang



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