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

[Blank Field]

If i understand it right, this software has a fixed latency error of 1
ms(1000us) in windows 8-10 due to different kernel timer implementation. So
i guess your latency is very good.
On Oct 29, 2015 8:40 AM, "Eddie Yen" <missile0407 at gmail.com> wrote:

> Thanks for information! And sorry I don'r read carefully at beginning
> message.
>
> For my result, I got about 1000μs below and only few times got 1000μs
> above when idling.
>
> I'm using 4820K and used 4 threads to VM, also  I set these 4 threads as 4
> cores in VM settings.
> The OS is Windows 10.
>
> 2015-10-29 13:21 GMT+08:00 Blank Field <ihatethisfield at gmail.com>:
>
>> I think they're using this:
>> www.thesycon.de/deu/latency_check.shtml
>> On Oct 29, 2015 6:11 AM, "Eddie Yen" <missile0407 at gmail.com> wrote:
>>
>>> 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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