2025.04.30-20:50

nixos_24.11_wlin001/system/tweaks/ssd-tweaks.nix

@@ -0,0 +1,18 @@
+{ config, ... }:
+
+{
+
+  boot.kernel.sysctl = {
+    #---------------------------------------------------------------------
+    #   SSD tweaks: Adjust settings for an SSD to optimize performance.
+    #---------------------------------------------------------------------
+    "vm.dirty_background_ratio" = "40";         # Set the ratio of dirty memory at which background writeback starts (5%). Adjusted for SSD.
+    "vm.dirty_expire_centisecs" = "3000";       # Set the time at which dirty data is old enough to be eligible for writeout (6000 centiseconds). Adjusted for SSD.
+    "vm.dirty_ratio" = "80";                    # Set the ratio of dirty memory at which a process is forced to write out dirty data (10%). Adjusted for SSD.
+    "vm.dirty_time" = "0";                      # Disable dirty time accounting.
+    "vm.dirty_writeback_centisecs" = "300";     # Set the interval between two consecutive background writeback passes (500 centiseconds)
+    };
+
+  services.fstrim.enable = true;
+
+}