On Tue, May 21, 2024 at 12:19:45PM -0600, Alex Williamson wrote: > On Tue, 21 May 2024 13:34:00 -0300 > Jason Gunthorpe <jgg@xxxxxxxxxx> wrote: > > > On Tue, May 21, 2024 at 10:21:23AM -0600, Alex Williamson wrote: > Intel folks might be able to comment on the performance hit relative to > iGPU assignment of denying the device the ability to use no-snoop > transactions (assuming the device control bit is actually honored). I don't have direct data for iGPU assignment. But I have a reference data regarding to virtio GPU. When backend GPU is iGPU for a virtio GPU, follow non-coherent path could increase performance up to 20%+ for some platforms. > The latency of flushing caches on touching no-snoop enable might be > prohibitive in the latter case. Thanks,
