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-To choose IO schedulers at boot time, use the argument 'elevator=deadline'.
-'noop' and 'cfq' (the default) are also available. IO schedulers are assigned
-globally at boot time only presently.
-
-Each io queue has a set of io scheduler tunables associated with it. These
-tunables control how the io scheduler works. You can find these entries
-in:
-
-/sys/block/<device>/queue/iosched
-
-assuming that you have sysfs mounted on /sys. If you don't have sysfs mounted,
-you can do so by typing:
-
-# mount none /sys -t sysfs
-
-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 deadline 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 deadline [cfq]
-# echo deadline > /sys/block/hda/queue/scheduler
-# cat /sys/block/hda/queue/scheduler
-noop [deadline] cfq