add ecn support in sysctl

modules/sys/sysctl.nix

@@ -2,9 +2,9 @@
   # 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
+    "vm.swappiness" = 200; 
     # BBR congestion control
-    "net.core.default_qdisc" = "fq";
+    "net.core.default_qdisc" = "cake";
     "net.ipv4.tcp_congestion_control" = "bbr";
     "kernel.sysrq" = 1;  # Enable SysRq for emergency recovery
 
@@ -14,5 +14,9 @@
     "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
+
+    # ECN
+    "net.ipv4.tcp_ecn" = 1;
+    "net.ipv4.tcp_ecn_fallback" = 1;
    };
 }