ia64/linux-2.6.18-xen.hg

view Documentation/block/switching-sched.txt @ 854:950b9eb27661

usbback: fix urb interval value for interrupt urbs.

Signed-off-by: Noboru Iwamatsu <n_iwamatsu@jp.fujitsu.com>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Apr 06 13:51:20 2009 +0100 (2009-04-06)
parents 831230e53067
children
line source
1 As of the Linux 2.6.10 kernel, it is now possible to change the
2 IO scheduler for a given block device on the fly (thus making it possible,
3 for instance, to set the CFQ scheduler for the system default, but
4 set a specific device to use the anticipatory or noop schedulers - which
5 can improve that device's throughput).
7 To set a specific scheduler, simply do this:
9 echo SCHEDNAME > /sys/block/DEV/queue/scheduler
11 where SCHEDNAME is the name of a defined IO scheduler, and DEV is the
12 device name (hda, hdb, sga, or whatever you happen to have).
14 The list of defined schedulers can be found by simply doing
15 a "cat /sys/block/DEV/queue/scheduler" - the list of valid names
16 will be displayed, with the currently selected scheduler in brackets:
18 # cat /sys/block/hda/queue/scheduler
19 noop anticipatory deadline [cfq]
20 # echo anticipatory > /sys/block/hda/queue/scheduler
21 # cat /sys/block/hda/queue/scheduler
22 noop [anticipatory] deadline cfq