tree 9520ffbb853af141af5b802fa00f5a2e4ed783bd
parent 3dde36ddea3e07dd025c4c1ba47edec91606fec0
author Corrado Zoccolo <czoccolo@gmail.com> 1267296340 +0100
committer Jens Axboe <jens.axboe@oracle.com> 1267382485 +0100

cfq-iosched: rethink seeky detection for SSDs

CFQ currently applies the same logic of detecting seeky queues and
grouping them together for rotational disks as well as SSDs.
For SSDs, the time to complete a request doesn't depend on the
request location, but only on the size.
This patch therefore changes the criterion to group queues by
request size in case of SSDs, in order to achieve better fairness.

Signed-off-by: Corrado Zoccolo <czoccolo@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>