[vfio-users] Brutal DPC Latency - how is yours? check it please and report back

[Nick Sukharev]

I just checked on W7 and I get 3000μs-4000μs one one of the guests when 3
guests are running.

On Wed, Oct 28, 2015 at 4:52 AM, Sergey Vlasov <sergey at vlasov.me> wrote:

> On 27 October 2015 at 18:38, LordZiru <lordziru at gmail.com> wrote:
>
>> I have brutal DPC Latency on qemu, no matter if using pci-assign or
>> vfio-pci or without any passthrought,
>>
>> my DPC Latency is like:
>> 10000,500,8000,6000,800,300,12000,9000,700,2000,9000
>> and on native windows 7 is like:
>> 20,30,20,50,20,30,20,20,30
>>
>
> In Windows 10 guest I constantly have red bars around 3000μs
> (microseconds), spiking sometimes up to 10000μs.
>
>
>> I don't know how to fix it.
>> this matter for me because i are using USB Sound Card for my VMs,
>> and i get sound drop-outs every 0-4 secounds
>>
>>
> That bugs me a lot too. I also use an external USB card and my DAW
> periodically drops out :(
>
> I haven't tried CPU pinning yet though. And perhaps I should try Windows 7.
>
>
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