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Message-ID: <9be36dfab79b17e108f71d51a6ebf39073e110c6.camel@web.de>
Date: Sun, 16 Mar 2025 14:09:26 +0100
From: Bert Karwatzki <spasswolf@....de>
To: Alex Deucher <alexdeucher@...il.com>, Balbir Singh <balbirs@...dia.com>
Cc: Ingo Molnar <mingo@...nel.org>, Kees Cook <kees@...nel.org>, Bjorn
Helgaas <bhelgaas@...gle.com>, Linus Torvalds
<torvalds@...ux-foundation.org>, Peter Zijlstra <peterz@...radead.org>,
Andy Lutomirski <luto@...nel.org>, linux-kernel@...r.kernel.org,
amd-gfx@...ts.freedesktop.org, spasswolf@....de
Subject: Re: commit 7ffb791423c7 breaks steam game
This is related to the admgpu.gttsize. My laptop has the maximum amount
of memory (64G) and usually gttsize is half of main memory size. I just
tested with cmdline="nokaslr amdgpi.gttsize=2048" and the problem does
not occur. So I did some more testing with varying gttsize and got this
for the built-in GPU
08:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] (rev c5)
(nokaslr is always enabeld)
gttssize input behaviour
2048 GOOD
2064 GOOD
2080 SEMIBAD (i.e. noticeable input lag but not as bad as below)
3072 BAD
4096 BAD
8192 BAD
16384 BAD
As the build-in GPU has ~512 VRAM there seems to be problems when gttsize >
4*VRAM so I tested for the discrete GPU with 8G of VRAM
gttsize input behaviour
49152 GOOD
64000 GOOD
So for the discrete GPU increasing gttsize does no reproduce the bug.
Bert Karwatzki
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