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authorMinchan Kim <minchan@kernel.org>2013-10-28 14:26:30 +0900
committerPhillip Lougher <phillip@squashfs.org.uk>2013-11-20 03:35:18 +0000
commitcd59c2ec5f37a2bc1315c9324aab6c21d43ffa1a (patch)
tree10c3dca3e50bdc1f58f025f02cd85a2bfd8d3420 /fs/squashfs/Kconfig
parent9508c6b90b3f57ecea4e7a896cf8325400fc0c6e (diff)
downloadlinux-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/Kconfig13
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