Messages in this thread | | | Date | Sun, 26 Jul 2020 23:33:48 +1000 | From | Geoffrey McRae <> | Subject | Re: Poor windows VFIO performance, GPU stalls (bisected) |
| |
On 2020-07-26 23:32, Geoffrey McRae wrote: > 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
Sorry, I just noticed my error, it should be: aa202f1f56960c60e7befaa0f49c72b8fa11b0a8
> >> >>> 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 >>>
| |