commit 70f99a5e185ee61609a5c64fbbc87916a42e9909 · kitten.sh/system

machines/irnbru/configuration.nix

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         imports = [ ];

     

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         modules = {

     

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           vram = {

     

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             wiredLimit = 8;

     

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             wiredLowWatermark = 20;

     

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           };

     

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           server = {

     

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             enable = true;

     

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             sshd.enable = true;

modules/base/default.nix

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           ./shell.nix

     

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           ./linux.nix

     

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           ./macos.nix

     

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           ./macos-vram.nix

     

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         ];

     

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       }

+36

modules/base/macos-vram.nix

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       { lib, config, helpers, ... }:

     

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       with lib;

     

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       let

     

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         cfg = config.modules.vram;

     

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       in helpers.darwinAttrs {

     

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         options.modules.vram = {

     

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           wiredLimit = mkOption {

     

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             default = null;

     

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             description = "Wired Memory Limit in GBs";

     

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             type = types.nullOr (types.ints.between 2 512);

     

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           };

     

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           wiredLowWatermark = mkOption {

     

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             default = null;

     

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             description = "Wired LWM (Low Watermark) in GBs";

     

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             type = types.nullOr (types.ints.between 2 512);

     

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           };

     

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         };

     

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         config = mkIf (cfg.wiredLimit != null || cfg.wiredLowWatermark != null) {

     

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           system.activationScripts.postActivation.text = let

     

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             setWiredLimitMb = optionalString (cfg.wiredLimit != null) ''

     

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               wired_memsize_mb=$(($(sysctl -n hw.memsize) / 1024 / 1024))

     

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               sysctl -w iogpu.wired_limit_mb="$((wired_memsize_mb - ${toString (cfg.wiredLimit * 1024)}))"

     

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             '';

     

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             setWiredLowWaterMarkMb = optionalString (cfg.wiredLowWatermark != null) ''

     

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               sysctl -w iogpu.wired_lwm_mb="$((${toString (cfg.wiredLowWatermark * 1024)}))"

     

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             '';

     

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           in ''

     

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             ${setWiredLimitMb}

     

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             ${setWiredLowWaterMarkMb}

     

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           '';

     

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         };

     

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       }

     

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