CONFIG_SQUASHFS_COMP_CACHE_FULL: Enable full caching of compressed blocks

General informations

The Linux kernel configuration item CONFIG_SQUASHFS_COMP_CACHE_FULL:

• prompt: Enable full caching of compressed blocks
• type: bool
• depends on: CONFIG_SQUASHFS
• defined in fs/squashfs/Kconfig
• found in Linux kernels: 6.16-rc+HEAD

Help text

This option enables caching of all compressed blocks, Without caching, repeated reads of the same files trigger excessive disk I/O, significantly reducinng performance in workloads like fio-based benchmarks.

For example, fio tests (iodepth=1, numjobs=1, ioengine=psync) show: With caching: IOPS=2223, BW=278MiB/s (291MB/s) Without caching: IOPS=815, BW=102MiB/s (107MB/s)

Enabling this option restores performance to pre-regression levels by caching all compressed blocks in the page cache, reducing disk I/O for repeated reads. However, this increases memory usage, which may be a concern in memory-constrained environments.

Enable this option if your workload involves frequent repeated reads and memory usage is not a limiting factor. If unsure, say N.

Hardware

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This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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