{lib, ...}: { boot.kernel.sysctl = { # Improved file monitoring "fs.inotify.max_user_instances" = 8192; "fs.inotify.max_user_watches" = 524288; # Disable watchdogs for maximum performance at the cost of resiliency "kernel.nmi_watchdog" = 0; "kernel.soft_watchdog" = 0; "kernel.split_lock_mitigate" = 0; "kernel.watchdog" = 0; # Network optimizations "net.core.default_qdisc" = "fq"; "net.ipv4.tcp_congestion_control" = "bbr"; "net.ipv4.tcp_mtu_probing" = lib.mkForce 1; # Memory management "vm.dirty_background_bytes" = 134217728; "vm.dirty_bytes" = 268435456; "vm.max_map_count" = lib.mkForce 2147483642; "vm.page-cluster" = 0; "vm.swappiness" = 180; "vm.watermark_boost_factor" = 0; "vm.watermark_scale_factor" = 125; }; services.udev.extraRules = '' # Significantly improved I/O performance ## SSD ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="kyber" ## NVME ACTION=="add|change", KERNEL=="nvme[0-9]n[0-9]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="kyber" ## MicroSD ACTION=="add|change", KERNEL=="mmcblk[0-9]p[0-9]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="bfq" ## HDD ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="bfq" ''; }