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authorCorrado Zoccolo <czoccolo@gmail.com>2010-02-27 19:45:40 +0100
committerJens Axboe <jens.axboe@oracle.com>2010-02-28 19:41:25 +0100
commit41647e7a91338dba21773a16af7474ef95e0929e (patch)
tree9520ffbb853af141af5b802fa00f5a2e4ed783bd /block/blk-settings.c
parent3dde36ddea3e07dd025c4c1ba47edec91606fec0 (diff)
downloadlinux-2.6.34-ux500-41647e7a91338dba21773a16af7474ef95e0929e.tar.gz
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>
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