forked from Minki/linux
23 lines
935 B
Plaintext
23 lines
935 B
Plaintext
|
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
|