34 lines
2.7 KiB
Nix
34 lines
2.7 KiB
Nix
{ config, ... }:
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# Control how and when data is written from memory to disk, which can have an impact on system performance and responsiveness.
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# useful for optimizing memory usage, disk writeback behavior, network settings, and other low-level kernel behaviors.
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{
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boot.kernelModules = ["tcp_bbr"];
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boot.kernel.sysctl = {
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"net.ipv4.tcp_congestion_control" = "bbr";
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"net.core.default_qdisc" = "fq";
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"net.ipv4.tcp_fastopen" = "3";
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#---------------------------------------------------------------------
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# Network and memory-related optimizationss for 4GB
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#---------------------------------------------------------------------
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"kernel.sysrq" = 1; # Enable SysRQ for rebooting the machine properly if it freezes. [Source](https://oglo.dev/tutorials/sysrq/index.html)
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"net.core.netdev_max_backlog" = 30000; # Help prevent packet loss during high traffic periods.
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"net.core.rmem_default" = 131072; # Default socket receive buffer size, improving network performance and applications that use sockets.
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"net.core.rmem_max" = 16777216; # Maximum socket receive buffer size, determining the amount of data that can be buffered in memory for network operations.
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"net.core.wmem_default" = 131072; # Default socket send buffer size, improving network performance and applications that use sockets.
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"net.core.wmem_max" = 16777216; # Maximum socket send buffer size, determining the amount of data that can be buffered in memory for network operations.
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"net.ipv4.ipfrag_high_threshold" = 8388608; # Reduce the chances of fragmentation.
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"net.ipv4.tcp_keepalive_intvl" = 30; # TCP keepalive interval between probes to detect if a connection is still alive.
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"net.ipv4.tcp_keepalive_probes" = 5; # TCP keepalive probes to detect if a connection is still alive.
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"net.ipv4.tcp_keepalive_time" = 60; # TCP keepalive interval in seconds to detect if a connection is still alive.
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"vm.dirty_background_bytes" = 8388608; # Data (8 MB) modified in memory and needs to be written to disk. (Adjusted for 4GB RAM)
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"vm.dirty_bytes" = 25165824; # Data (24 MB) modified in memory and needs to be written to disk. (Adjusted for 4GB RAM)
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"vm.min_free_kbytes" = 32768; # Minimum free memory for safety (in KB), helping prevent memory exhaustion situations. (Adjusted for 4GB RAM)
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"vm.swappiness" = 20; # Adjust how aggressively the kernel swaps data from RAM to disk. Lower values prioritize keeping data in RAM. (Adjusted for 4GB RAM)
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"vm.vfs_cache_pressure" = 100; # Adjust vfs_cache_pressure (0-1000) to manage memory used for caching filesystem objects. (Adjusted for 4GB RAM)
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};
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}
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