* dual RX460 result in logspam about P2P DMA
@ 2021-05-15 14:11 Richard Dietrich Wachler
2021-05-17 13:59 ` Alex Deucher
0 siblings, 1 reply; 2+ messages in thread
From: Richard Dietrich Wachler @ 2021-05-15 14:11 UTC (permalink / raw)
To: dri-devel
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.
Richard Wachler
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: dual RX460 result in logspam about P2P DMA
2021-05-15 14:11 dual RX460 result in logspam about P2P DMA Richard Dietrich Wachler
@ 2021-05-17 13:59 ` Alex Deucher
0 siblings, 0 replies; 2+ messages in thread
From: Alex Deucher @ 2021-05-17 13:59 UTC (permalink / raw)
To: Richard Dietrich Wachler; +Cc: Maling list - DRI developers
On Sat, May 15, 2021 at 10:12 AM Richard Dietrich Wachler
<rwachler@posteo.net> 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@amd.com/
Alex
^ permalink raw reply [flat|nested] 2+ messages in thread
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