2025.04.30-20:50

nixos_24.11_cinnamon/config/tweaks/hdd-tweak.nix

@@ -0,0 +1,19 @@
+{ config, ... }:
+
+# Control how and when data is written from memory to disk, which can have an impact on system performance and responsiveness.  
+# useful for optimizing memory usage, disk writeback behavior, network settings, and other low-level kernel behaviors.
+
+{
+  boot.kernel.sysctl = {
+
+    #---------------------------------------------------------------------
+    # HDD tweaks: Adjust settings for an HDD to optimize performance.
+    #---------------------------------------------------------------------
+    "vm.dirty_background_ratio" = "10";       # Set the ratio of dirty memory at which background writeback starts (10% for HDD).
+    "vm.dirty_expire_centisecs" = "6000";     # Set the time at which dirty data is old enough to be eligible for writeout (6000 centiseconds for HDD).
+    "vm.dirty_ratio" = "20";                  # Set the ratio of dirty memory at which a process is forced to write out dirty data (20% for HDD).
+    "vm.dirty_time" = "0";                    # Disable dirty time accounting.
+    "vm.dirty_writeback_centisecs" = "1000";  # Set the interval between two consecutive background writeback passes (1000 centiseconds for HDD).
+
+  };
+}