Messages in this thread | | | Date | Sun, 26 Jul 2020 23:32:13 +1000 | From | Geoffrey McRae <> | Subject | Re: Poor windows VFIO performance, GPU stalls (bisected) |
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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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