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

[Eddie Yen]

Sorry, but how to check DPC Latency?

2015-10-29 10:08 GMT+08:00 Nick Sukharev <nicksukharev at gmail.com>:

> 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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>>
>
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