From fc5fb9af0ed91860e5f8a0a41ac95d323fefc7ce Mon Sep 17 00:00:00 2001
From: k3t <k3t@k3t.dev>
Date: Sat, 8 Aug 2026 01:25:08 -0600
Subject: [PATCH] many performance optimizations

---
 modules/sys/hw/cpu/amd64.nix | 23 ++++++++++++++-----
 modules/sys/hw/cpu/intel.nix | 18 +++++++++++----
 modules/sys/hw/gpu/amd.nix   |  1 +
 modules/sys/hw/gpu/intel.nix | 34 ++++++++++++++++------------
 modules/sys/perf.nix         | 44 +++++++++++++++++++++++++++++-------
 5 files changed, 86 insertions(+), 34 deletions(-)

diff --git a/modules/sys/hw/cpu/amd64.nix b/modules/sys/hw/cpu/amd64.nix
index cf4a151..e0d7d8f 100644
--- a/modules/sys/hw/cpu/amd64.nix
+++ b/modules/sys/hw/cpu/amd64.nix
@@ -1,9 +1,20 @@
 { pkgs, ... }:
 
 {
-  hardware.cpu.amd.updateMicrocode = true;
-  boot.kernelPackages = pkgs.linuxPackages_xanmod_latest;
-  boot.binfmt.preferStaticEmulators = true;
-  boot.binfmt.emulatedSystems = [ "aarch64-linux" "x86_64-windows" ];
-  boot.kernelModules = [ "kvm-amd" ];
-}
\ No newline at end of file
+  hardware.cpu.amd = {
+    ryzen-smu.enable = true;
+    updateMicrocode = true;
+  };
+  boot = {
+    binfmt = {
+      preferStaticEmulators = true;
+      emulatedSystems = [ "aarch64-linux" "x86_64-windows" ];
+    };
+    kernelModules = [ "kvm-amd" ];
+    kernelPackages = pkgs.linuxPackages_xanmod_latest;
+  };
+  programs = {
+    ryzen-monitor-ng.enable = true;
+    corectrl.enable = true;
+  };
+}
diff --git a/modules/sys/hw/cpu/intel.nix b/modules/sys/hw/cpu/intel.nix
index ef203b6..4f35a1e 100644
--- a/modules/sys/hw/cpu/intel.nix
+++ b/modules/sys/hw/cpu/intel.nix
@@ -2,8 +2,16 @@
 
 {
   hardware.cpu.intel.updateMicrocode = true;
-  boot.kernelPackages = pkgs.linuxPackages_xanmod_latest;
-  boot.binfmt.preferStaticEmulators = true;
-  boot.binfmt.emulatedSystems = [ "aarch64-linux" "x86_64-windows" ];
-  boot.kernelModules = [ "kvm-intel" ];
-}
\ No newline at end of file
+  boot = {
+    binfmt = {
+      preferStaticEmulators = true;
+      emulatedSystems = [ "aarch64-linux" "x86_64-windows" ];
+    };
+    kernelModules = [ "kvm-intel" ];
+    kernelPackages = pkgs.linuxPackages_xanmod_latest;
+    };
+  services = {
+    thermald.enable = true;
+    throttled.enable = true;
+  };
+}
diff --git a/modules/sys/hw/gpu/amd.nix b/modules/sys/hw/gpu/amd.nix
index 9dcaa9b..735d1a9 100644
--- a/modules/sys/hw/gpu/amd.nix
+++ b/modules/sys/hw/gpu/amd.nix
@@ -6,6 +6,7 @@
   nixpkgs.config.rocmSupport = true;
   hardware = {
     amdgpu = {
+      overdrive.enable = true;
       opencl.enable = true;
       initrd.enable = true;
       zluda.enable = true;
diff --git a/modules/sys/hw/gpu/intel.nix b/modules/sys/hw/gpu/intel.nix
index 5b2e44f..44e057a 100644
--- a/modules/sys/hw/gpu/intel.nix
+++ b/modules/sys/hw/gpu/intel.nix
@@ -2,20 +2,24 @@
 {
   boot.kernelParams = [ "i915.enable_guc=3" ];
   # Graphics
-  hardware.enableRedistributableFirmware = true;
-  hardware.graphics = {
-    enable = true;
-    enable32Bit = true;
-    extraPackages = with pkgs; [
-      # Required for modern Intel GPUs (Xe iGPU and ARC)
-      intel-media-driver     # VA-API (iHD) userspace
-      vpl-gpu-rt             # oneVPL (QSV) runtime
+  hardware = {
+    enableRedistributableFirmware = true;
+    intel-gpu-tools.enable = true;
+    graphics = {
+      enable = true;
+      enable32Bit = true;
+      extraPackages = with pkgs; [
+        # Required for modern Intel GPUs (Xe iGPU and ARC)
+        intel-media-driver     # VA-API (iHD) userspace
+        vpl-gpu-rt             # oneVPL (QSV) runtime
 
-      # Optional (compute / tooling):
-      intel-compute-runtime  # OpenCL (NEO) + Level Zero for Arc/Xe
-      # NOTE: 'intel-ocl' also exists as a legacy package; not recommended for Arc/Xe.
-      libvdpau-va-gl       # Only if you must run VDPAU-only apps
-      vkbasalt
-    ];
+        # Optional (compute / tooling):
+        intel-compute-runtime  # OpenCL (NEO) + Level Zero for Arc/Xe
+        # NOTE: 'intel-ocl' also exists as a legacy package; not recommended for Arc/Xe.
+        libvdpau-va-gl       # Only if you must run VDPAU-only apps
+        vkbasalt
+      ];
+    };
   };
-}
\ No newline at end of file
+  virtualisation.kvmgt.enable = true;
+}
diff --git a/modules/sys/perf.nix b/modules/sys/perf.nix
index 21935c5..b50ed77 100644
--- a/modules/sys/perf.nix
+++ b/modules/sys/perf.nix
@@ -8,17 +8,45 @@
     };
   };
   services.fstrim.enable = true;
-  services.system76-scheduler.enable = true;
-  #services.thermald.enable = true;
+  services.system76-scheduler = {
+    enable = true;
+    settings = {
+      processScheduler = {
+        foregroundBoost = {
+          #background = {
+          #  ioClass = "idle";
+          #};
+          foreground = {
+            ioClass = "realtime";
+            class = "fifo";
+          };
+        };
+        pipewireBoost.profile = {
+          ioClass = "realtime";
+          class = "fifo";
+        };
+      };
+    };
+  };
   services.power-profiles-daemon.enable = true;
-  systemd.coredump.enable = false;
+  systemd.coredump = { # https://discourse.nixos.org/t/how-to-completely-disable-coredump/77335/11
+    enable = true;
+    settings.Coredump = {
+      Storage = "none";
+      ProcessSizeMax = "0";
+  };
   zramSwap = {
     enable = true;
     algorithm = "zstd";
     memoryPercent = 90;
   };
-  services.udev.extraRules = ''
-  ACTION=="add|change", KERNEL=="nvme[0-9]*", ATTR{queue/scheduler}="kyber"
-  ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="kyber"
-  '';
-}
\ No newline at end of file
+  hardware.block.scheduler = {
+    "mmcblk[0-9]*" = "bfq";
+    "nvme[0-9]*"   = "kyber";
+    "sd[a-z]"      = "kyber";
+  };
+  services.scx = {
+    enable = true;
+    scheduler = "scx_cake";
+  };
+}