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Sun, 16 Mar 2025 14:09:28 +0100 Message-ID: <9be36dfab79b17e108f71d51a6ebf39073e110c6.camel@web.de> Subject: Re: commit 7ffb791423c7 breaks steam game From: Bert Karwatzki To: Alex Deucher , Balbir Singh Cc: Ingo Molnar , Kees Cook , Bjorn Helgaas , Linus Torvalds , Peter Zijlstra , Andy Lutomirski , linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, spasswolf@web.de Date: Sun, 16 Mar 2025 14:09:26 +0100 In-Reply-To: References: <20250310112206.4168-1-spasswolf@web.de> <951f9d13-72e4-41c3-9ace-8639e2a9485d@nvidia.com> <09131c563332c892284ec7fb4ce706996131db8c.camel@web.de> <9a5df5627d3d72b2a97f501dfb7d944cc1e9920f.camel@web.de> <414f4deb8c7670a159854006b0c410ce05a6049e.camel@web.de> <12d950ee-4152-4ad6-b93e-7c5b75804b1a@nvidia.com> <705e95cec3dc5181ca2aa73722e6b84f63f3e91d.camel@web.de> <20b5823e-247a-456a-bb55-d50f212a9f5a@nvidia.com> <146277bb0ecbb392d490683c424b8ae0dfa82838.camel@web.de> <7866593f-0322-4fb3-9729-82366940fc85@nvidia.com> <5d34bfc5109b8d104fd4f8550dd17945344f9d07.camel@web.de> <551b9797-20d6-4bfe-b54c-84dd7aae7794@nvidia.com> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.55.3-1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:1ziCuTaJLlr4/NNT3PlCqR0n3Z6k+RO4XmQJ9tGibHYEfS1WmQs Alsz8CYX0Jw/w3N/csNYOq9YTUaLDBnQAZeKQT3PBSRZz2QbfqKrbyGnGRIBWgQj71Lgdyh C9/jsYywMlniLJOyzLjyqg+Jl51vs4dxDHrXg0J/bgfnXTokYqiqxmEcEcqkWBZOmKWJafO 70xtHET54OH4ZCDOu4IuA== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:vcRBeoKbmhg=;0ppaj85vFzT3WQfDA9cwKWGHHRY vq2S9rG3y3+HBNTo8SnKsc0PZ7VX12vX9hUKZ7FkqfC6TvAndZKKqsNpI93/+X8HXILh6aRkH 2aoDH+Uige0ZYw1n3lnZFZ5CPlWERGiZtPUZUWrDJMmTI/UIDFGFnC7DvVNIpqq2ttlGR+Yku Wf1u+Y7S8lc0bieIPqhkqgbJwtD/PVR2V8l14d4h/vbckIbRJ+X04+4yBdAkwS+yrt+qi/Uof Tas0VqLni3mL3x3w7Wnq7/iMbqPeXhFOg1XRegn7N4ddiK6THDWd4z9voDWE6/xEoZtKfakN+ TTIoXjUpzozfZiB9mGo7jfW7wAobbgGlra1n5KYCEmuJcmL42C638yPzHn8teodGjh3g8HZ2r jjyRnnES5lW5GbAI/q/YhkBRMjWPRO4nftJgsbJ/s1aBeWWIB0LrsonKPd31KjwEWbeWWhmJE qJ+7qgA8mxZGHNHNJGQdOGzVtFlGEjMb1airIU3TZGTcLY9AygZQsgr+TDvXBaSfa1n7hLYjz p68JHQXfT4je7rFl5VpIBU03bS6TXULe4W6qOXakUD6gpwjCKyqqYvzdO4VG98DSkGnpa6x2U U0Q+fu3aTYK0DRpNQoKHgywmHvrsCqIWGK+7cP3e2W0S+SCK2OTT69U50OBT8rwdAf+b+lVQD LEomU2bkOKzkDmj06coAtmXr4mpA9hY8fL6jl81EWEfbgRk7A2Xd3YOlmKo72d+iuIo+FO5b4 xF35UFiSZa6YtUZr4J1tXYWFJG15HYNVhDAo3dcFVLqqxecwnGbQGyevdDNu3wIutMHZBCUq2 XSTZN0foRj7F3z9qm+9k6FXfBGlIBTxJbm7IDivn6K9fuhDZdaGALBAQdwhACDt1RR9wTxia6 NJPWwsKC52UUdS67gqjG171M26Rui9xJUcw+dc7pNPX1phnAujIGSs7Kdt4Yw2OQaUfe7mMMx UsezZW38nWUQnZ8D+E8+TdpJasyIBlX5AlFs3xBMMgprkxcV3piHamNP8X8Z2r+BywFPhNoWN fvW8RUerkeGnTkQJWMTQpS8MS71gbvMRBG6jyZr56o8O6TecQc3KG1koBGn6e76GuvHWQnkiY oRJYmnoBRMqhYSO8XBII8C0iRGfeQstuLhfPEVgp2efeFfsJT3eaTtBNl4dcsoaCixDrNpiMA xSY7UfE9Gon50zUKe0s58DYdmIiuT5wkRk6wGEScUjs4B8wCh1VInsKpULOCm1T+sP+BIlgBX Lr6qIiloMTGon2paHtPmh4mC1W4SFdE/SLBL8zQRKn6fUZ1nqeEv/+Ou5JNCEF+Ozv+DjLRbr v0b7WkLrgAfvzs1+sXQH9EyC/ijJyVQsci0+OJev3igGNwVES+AbIc5dzuMW/eOYKkqpr6SR5 mFm49EeAIO1as4OZ1wgBttE7pVsEbRSbZgByDXTbv92O4EDEfRNaJvQht2myafjA9TSRgzAAy GjXD6fg== This is related to the admgpu.gttsize. My laptop has the maximum amount=C2= =A0 of memory (64G) and usually gttsize is half of main memory size. I just=C2= =A0 tested with cmdline=3D"nokaslr amdgpi.gttsize=3D2048" and the problem does= =C2=A0 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