diff options
Diffstat (limited to 'fs/squashfs/Kconfig')
| -rw-r--r-- | fs/squashfs/Kconfig | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig index 60fc98bdf421..a9602aae21ef 100644 --- a/fs/squashfs/Kconfig +++ b/fs/squashfs/Kconfig @@ -5,8 +5,8 @@ config SQUASHFS help Saying Y here includes support for SquashFS 4.0 (a Compressed Read-Only File System). Squashfs is a highly compressed read-only - filesystem for Linux. It uses zlib, lzo or xz compression to - compress both files, inodes and directories. Inodes in the system + filesystem for Linux. It uses zlib, lz4, lzo, xz or zstd compression + to compress both files, inodes and directories. Inodes in the system are very small and all blocks are packed to minimise data overhead. Block sizes greater than 4K are supported up to a maximum of 1 Mbytes (default block size 128K). SquashFS 4.0 supports 64 bit filesystems @@ -16,7 +16,7 @@ config SQUASHFS Squashfs is intended for general read-only filesystem use, for archival use (i.e. in cases where a .tar.gz file may be used), and in embedded systems where low overhead is needed. Further information - and tools are available from http://squashfs.sourceforge.net. + and tools are available from github.com/plougher/squashfs-tools. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), @@ -149,6 +149,27 @@ config SQUASHFS_XATTR If unsure, say N. +config SQUASHFS_COMP_CACHE_FULL + bool "Enable full caching of compressed blocks" + depends on SQUASHFS + default n + help + 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. + config SQUASHFS_ZLIB bool "Include support for ZLIB compressed file systems" depends on SQUASHFS |