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author | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-20 08:17:04 -0700 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-20 08:17:04 -0700 |
commit | 402a26f0c040077ed6f941eefac5a6971f0d5f40 (patch) | |
tree | f74e5d732404e9716b3c753007bac0f5d1e92869 /Documentation | |
parent | bf7cf6ee1bd00679bbe93b6ae73f80032759b8df (diff) | |
parent | 4f73247f0e53be1bd4aa519476e6261a8e4a64ab (diff) | |
download | linux-stable-402a26f0c040077ed6f941eefac5a6971f0d5f40.tar.gz linux-stable-402a26f0c040077ed6f941eefac5a6971f0d5f40.tar.bz2 linux-stable-402a26f0c040077ed6f941eefac5a6971f0d5f40.zip |
Merge branch 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-block
* 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-block:
[PATCH] block/elevator.c: remove unused exports
[PATCH] splice: fix smaller sized splice reads
[PATCH] Don't inherit ->splice_pipe across forks
[patch] cleanup: use blk_queue_stopped
[PATCH] Document online io scheduler switching
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/block/switching-sched.txt | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/block/switching-sched.txt b/Documentation/block/switching-sched.txt new file mode 100644 index 000000000000..5fa130a67531 --- /dev/null +++ b/Documentation/block/switching-sched.txt @@ -0,0 +1,22 @@ +As of the Linux 2.6.10 kernel, it is now possible to change the +IO scheduler for a given block device on the fly (thus making it possible, +for instance, to set the CFQ scheduler for the system default, but +set a specific device to use the anticipatory or noop schedulers - which +can improve that device's throughput). + +To set a specific scheduler, simply do this: + +echo SCHEDNAME > /sys/block/DEV/queue/scheduler + +where SCHEDNAME is the name of a defined IO scheduler, and DEV is the +device name (hda, hdb, sga, or whatever you happen to have). + +The list of defined schedulers can be found by simply doing +a "cat /sys/block/DEV/queue/scheduler" - the list of valid names +will be displayed, with the currently selected scheduler in brackets: + +# cat /sys/block/hda/queue/scheduler +noop anticipatory deadline [cfq] +# echo anticipatory > /sys/block/hda/queue/scheduler +# cat /sys/block/hda/queue/scheduler +noop [anticipatory] deadline cfq |