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SubjectRe: Poor windows VFIO performance, GPU stalls (bisected)


On 2020-07-26 23:30, Alex Williamson wrote:
> On Sun, 26 Jul 2020 17:49:07 +1000
> Geoffrey McRae <geoff@hostfission.com> wrote:
>
>> Hi All,
>>
>> The commit 22540ca3d00d2990a4148a13b92209c3dc5422db causes a Windows
>> KVM
>> guest running under QEMU with a VFIO passthrough GPU to randomly stall
>> when using the GPU leading to the guest assuming that the driver has
>> hung. Reverting this commit resolves the problem.
>
> Please double check this commit ID, I can't find it in mainline or
> linux-next. Thanks,
>
> Alex

Confirmed:

https://github.com/torvalds/linux/commit/22540ca3d00d2990a4148a13b92209c3dc5422db

>
>> The host system is configured with the following kernel arguments
>> which
>> may be related:
>> isolcpus=0-5,24-29,6-11,30-35 rcu_nocbs=0-5,24-29,6-11,30-35
>>
>> The system is an AMD Threadripper 2970WX on a Gigabyte x399 AORUS
>> Gaming
>> 7 board.
>> It has two GPUs each being passed through to two separate KVM guests,
>> one is an AMD Radeon 7 in a Linux guest, the other is a GeForce 1080Ti
>> in a Windows guest.
>> The cores used for these two guests are isolated from the host for
>> performance reasons.
>>
>> Any insight as to why this is occurring would be appreciated. If you
>> need any more information or would like to test patches please let me
>> know.
>>
>> Kind Regards,
>> Geoffrey McRae
>> HostFission
>>
>> https://hostfission.com
>>

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