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nixos/throttled: disable kernel msr warning #102106

Merged
merged 1 commit into from
Dec 29, 2020
Merged

nixos/throttled: disable kernel msr warning #102106

merged 1 commit into from
Dec 29, 2020
+6 −0

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tadfisher
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Motivation for this change

Kernel 5.9 has begun printing warnings whenever userspace writes to CPU MSR registers, which throttled does to control CPU voltage. See erpalma/throttled#215

The kernel devs are working on a solution for this issue, which may involve a new API for controlling CPU voltage. See https://lore.kernel.org/lkml/20200907094843.1949-1-Jason@zx2c4.com/T/#u

In the meantime, to avoid spamming the kernel log buffer, enable msr.allow_writes for kernels 5.9 and newer.

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.

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@tadfisher
nixos/throttled: disable kernel msr warning

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prusnak Pavol Rusnak
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@ofborg ofborg bot added 6.topic: nixos Issues or PRs affecting NixOS modules, or package usability issues specific to NixOS 8.has: module (update) This PR changes an existing module in `nixos/` 10.rebuild-darwin: 0 This PR does not cause any packages to rebuild on Darwin 10.rebuild-linux: 0 This PR does not cause any packages to rebuild on Linux labels Oct 29, 2020
bkchr
bkchr approved these changes Nov 11, 2020
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Works for me 👍

@Patryk27
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Works for me too 👍

@flokli
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flokli commented Dec 29, 2020

Too bad the LKML discussion has gotten somewhat silent. Setting this in the throttled module is probably fine.

@flokli flokli merged commit 316862f into NixOS:master Dec 29, 2020
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6.topic: nixos Issues or PRs affecting NixOS modules, or package usability issues specific to NixOS 8.has: module (update) This PR changes an existing module in `nixos/` 10.rebuild-darwin: 0 This PR does not cause any packages to rebuild on Darwin 10.rebuild-linux: 0 This PR does not cause any packages to rebuild on Linux
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@tadfisher @Patryk27 @flokli @bkchr