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author | James Bottomley | 2006-06-10 20:47:26 +0200 |
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committer | James Bottomley | 2006-06-10 20:47:26 +0200 |
commit | f0cd91a68acdc9b49d7f6738b514a426da627649 (patch) | |
tree | 8ad73564015794197583b094217ae0a71e71e753 /Documentation/block/switching-sched.txt | |
parent | [SCSI] spi transport: don't allow dt to be set on SE or HVD buses (diff) | |
parent | Merge branch 'upstream-fixes' of master.kernel.org:/pub/scm/linux/kernel/git/... (diff) | |
download | kernel-qcow2-linux-f0cd91a68acdc9b49d7f6738b514a426da627649.tar.gz kernel-qcow2-linux-f0cd91a68acdc9b49d7f6738b514a426da627649.tar.xz kernel-qcow2-linux-f0cd91a68acdc9b49d7f6738b514a426da627649.zip |
Merge ../linux-2.6
Diffstat (limited to 'Documentation/block/switching-sched.txt')
-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 |