Mastodawn

Is there anything like Dx12 SetStablePowerMode available on linux?

@WaitForPresent on which hardware? I'm not sure if there's a useful cross-vendor API hooked up anywhere but getting stable clocks on amd is a matter of writing some values to some files.

https://docs.kernel.org/gpu/amdgpu/thermal.html profile_peak / profile_standard here for amdgpu.

GPU Power/Thermal Controls and Monitoring — The Linux Kernel documentation

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Philip Trettner Feb 10

@dotstdy @WaitForPresent I got `echo performance | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor` for that (works on the intel/amd I use)

EDIT: apparently this needs cpufreq kernel stuff and might not work reliably, but at least it's a term to look up

EDIT2: this is _CPU_, not _GPU_, my bad

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Josh Simmons Feb 10

@artificialmind @WaitForPresent that's CPU scaling rather than GPU, and setting the governor itself is not exactly sufficient anymore.

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Philip Trettner Feb 10

@dotstdy @WaitForPresent Oh wow missing some coffee here, totally misread that, sorry!

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Josh Simmons Feb 10

@artificialmind @WaitForPresent no biggie, there's also "game mode" which sets a bunch of these tunables automatically. But not useful for profiling alas.

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Philip Trettner Feb 10

@dotstdy @WaitForPresent Ok but I found similar knobs for NVidia in nvidia-smi: https://docs.nvidia.com/deploy/nvidia-smi/index.html (-lgc and -lmc are for locking clock rates). Global, requires root, requires specific values, BUT might make for a better benchmarking experience anyways.

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Josh Simmons Feb 10

@artificialmind @WaitForPresent one more thing, if you use something like VK_KHR_performance_query, on amd hardware that will put your GPU into profile clocks. Idk if there's an extension I'm missing which lets you specify it directly.

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WaitForPresent

@dotstdy @artificialmind Yeah that does not seem to be a thing (the VK_KHR_performance_query part) on the proprietary Nvidia driver at least.