integrate htpc and associated configuration

modules/sys/sysctl.nix

@@ -0,0 +1,18 @@
+{
+  # Transparent Hugepages for better memory performance
+  boot.kernel.sysctl = {
+    "vm.max_map_count" = 1048576;  # For some games that need it
+    "vm.swappiness" = 200;  # Reduce swapping
+    # BBR congestion control
+    "net.core.default_qdisc" = "fq";
+    "net.ipv4.tcp_congestion_control" = "bbr";
+    "kernel.sysrq" = 1;  # Enable SysRq for emergency recovery
+
+    # CachyOS performance tweaks
+    "kernel.nmi_watchdog" = 0;  # Disable NMI watchdog (reduces overhead)
+    "vm.vfs_cache_pressure" = 50;  # Better file cache retention
+    "vm.dirty_ratio" = 10;  # Faster writes to disk
+    "vm.dirty_background_ratio" = 5;  # Background write threshold
+    "kernel.sched_autogroup_enabled" = 0;  # Better CPU scheduling for gaming
+   };
+}