mirror of
https://github.com/ryan4yin/nix-config.git
synced 2026-03-24 01:41:00 +01:00
f6aa45aa00
feat: luks automatic unlock via tpm2 chip for all physical hosts feat: enable login manager fix: Rename network interface config back following hardware change
45 lines
2.3 KiB
Nix
45 lines
2.3 KiB
Nix
{ lib, ... }:
|
||
{
|
||
# Enable in-memory compressed devices and swap space provided by the zram kernel module.
|
||
# By enable this, we can store more data in memory instead of fallback to disk-based swap devices directly,
|
||
# and thus improve I/O performance when we have a lot of memory.
|
||
#
|
||
# https://www.kernel.org/doc/Documentation/blockdev/zram.txt
|
||
zramSwap = {
|
||
enable = true;
|
||
# one of "lzo", "lz4", "zstd"
|
||
algorithm = lib.mkDefault "zstd";
|
||
# Priority of the zram swap devices.
|
||
# It should be a number higher than the priority of your disk-based swap devices
|
||
# (so that the system will fill the zram swap devices before falling back to disk swap).
|
||
priority = lib.mkDefault 100;
|
||
# Maximum total amount of memory that can be stored in the zram swap devices (as a percentage of your total memory).
|
||
# Defaults to 1/2 of your total RAM. Run zramctl to check how good memory is compressed.
|
||
# This doesn’t define how much memory will be used by the zram swap devices.
|
||
memoryPercent = lib.mkDefault 50;
|
||
};
|
||
|
||
# Optimizing swap on zram
|
||
boot.kernel.sysctl = {
|
||
# vm.swappiness - Controls kernel preference for swapping (range: 0-200, default: 60)
|
||
# For in-memory swap devices like zram/zswap, values above 100 are recommended.
|
||
"vm.swappiness" = lib.mkDefault 180;
|
||
|
||
# vm.watermark_boost_factor - Controls aggressiveness of memory reclaim (default: 15000)
|
||
# Setting to 0 disables watermark boost, preventing premature memory reclamation.
|
||
# This allows fuller memory utilization before the kernel starts reclaiming pages.
|
||
"vm.watermark_boost_factor" = lib.mkDefault 0;
|
||
|
||
# vm.watermark_scale_factor - Controls kswapd wakeup frequency (range: 1-1000, default: 10)
|
||
# A higher value triggers background memory reclamation earlier (at 12.5% memory pressure).
|
||
# Value 125 means kswapd becomes active when free memory drops below 1/125 of total memory,
|
||
# balancing memory more proactively to prevent sudden swap storms at high swappiness values.
|
||
"vm.watermark_scale_factor" = lib.mkDefault 125;
|
||
|
||
# vm.page-cluster - Controls swap readahead (range: 0-6, default: 3)
|
||
# 0 means read only 1 page (2^0) at a time, disabling readahead.
|
||
# For low-latency devices like zram, readahead hurts performance by fetching unnecessary data.
|
||
"vm.page-cluster" = lib.mkDefault 0;
|
||
};
|
||
}
|