Swap: Difference between revisions
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== Zswap swap cache == | == Zswap swap cache == | ||
[https://docs.kernel.org/admin-guide/mm/zswap.html Zswap] is a | [https://docs.kernel.org/admin-guide/mm/zswap.html Zswap] is a compressed RAM cache for swap pages. It acts as a middle layer between system memory and a traditional disk-based swap device, storing compressed pages in RAM before optionally writing them out to disk-based swap if necessary. It acts as an LRU cache. | ||
Unlike zram, zswap requires a disk-based swap device to back it. | Unlike zram, zswap requires a disk-based swap device or file to back it. | ||
Zswap is controlled by kernel parameters and can be enabled in your NixOS configuration by setting appropriate options through <code>boot.kernelParams</code>. | Zswap is controlled by kernel parameters and can be enabled in your NixOS configuration by setting appropriate options through <code>boot.kernelParams</code>. | ||
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"zswap.compressor=lz4" # compression algorithm | "zswap.compressor=lz4" # compression algorithm | ||
"zswap.max_pool_percent=20" # maximum percentage of RAM that zswap is allowed to use | "zswap.max_pool_percent=20" # maximum percentage of RAM that zswap is allowed to use | ||
"zswap.shrinker_enabled=1" # whether to shrink the pool proactively on high memory pressure | |||
]; | ]; | ||
</nowiki> | </nowiki> | ||