On Sat, May 15, 2021 at 10:12 AM Richard Dietrich Wachler <rwachler@xxxxxxxxxx> wrote: > > Excuse my novicesness, > > i use 2 RX460 on a KGPE-D16 server board to drive 4 displays. > > 02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. > [AMD/ATI] Baffin [Radeon RX 460/560D / Pro > 450/455/460/555/555X/560/560X] (rev cf) > 06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. > [AMD/ATI] Baffin [Radeon RX 460/560D / Pro > 450/455/460/555/555X/560/560X] (rev cf) > > There is a noticeable mouse lag on the second card, so i investigated > and got logspam 20 times a second like this: > > May 15 15:58:27 xx kernel: amdgpu 0000:02:00.0: cannot be used for > peer-to-peer DMA as the client and provider (0000:06:00.0) do not share > an upstream bridge or whitelisted host bridge > > It seems there is no real way to disable the check or disable P2P DMA > completely. Or maybe my problem is elsewhere? > > Thanks for any hints, i havent found anything about this as its quite a > new feature. Fixed in this patch: https://patchwork.kernel.org/project/dri-devel/patch/20210517115705.2141-1-christian.koenig@xxxxxxx/ Alex
