diff options
| author | Minchan Kim <minchan@kernel.org> | 2013-10-28 14:26:30 +0900 |
|---|---|---|
| committer | Phillip Lougher <phillip@squashfs.org.uk> | 2013-11-20 03:35:18 +0000 |
| commit | cd59c2ec5f37a2bc1315c9324aab6c21d43ffa1a (patch) | |
| tree | 10c3dca3e50bdc1f58f025f02cd85a2bfd8d3420 /fs/squashfs/Kconfig | |
| parent | 9508c6b90b3f57ecea4e7a896cf8325400fc0c6e (diff) | |
| download | linux-cd59c2ec5f37a2bc1315c9324aab6c21d43ffa1a.tar.bz2 | |
squashfs: Enhance parallel I/O
Now squashfs have used for only one stream buffer for decompression
so it hurts parallel read performance so this patch supports
multiple decompressor to enhance performance parallel I/O.
Four 1G file dd read on KVM machine which has 2 CPU and 4G memory.
dd if=test/test1.dat of=/dev/null &
dd if=test/test2.dat of=/dev/null &
dd if=test/test3.dat of=/dev/null &
dd if=test/test4.dat of=/dev/null &
old : 1m39s -> new : 9s
* From v1
* Change comp_strm with decomp_strm - Phillip
* Change/add comments - Phillip
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Diffstat (limited to 'fs/squashfs/Kconfig')
| -rw-r--r-- | fs/squashfs/Kconfig | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig index c70111ebefd4..1c6d340fc61f 100644 --- a/fs/squashfs/Kconfig +++ b/fs/squashfs/Kconfig @@ -63,6 +63,19 @@ config SQUASHFS_LZO If unsure, say N. +config SQUASHFS_MULTI_DECOMPRESSOR + bool "Use multiple decompressors for handling parallel I/O" + depends on SQUASHFS + help + By default Squashfs uses a single decompressor but it gives + poor performance on parallel I/O workloads when using multiple CPU + machines due to waiting on decompressor availability. + + If you have a parallel I/O workload and your system has enough memory, + using this option may improve overall I/O performance. + + If unsure, say N. + config SQUASHFS_XZ bool "Include support for XZ compressed file systems" depends on SQUASHFS |