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(parent: 31dcfab) | patch
cfq-iosched: remove limit of dispatch depth of max 4 times quantum
authorJens Axboe <jens.axboe@oracle.com>
Mon, 20 Oct 2008 13:44:28 +0000 (15:44 +0200)
committerJens Axboe <jens.axboe@oracle.com>
Mon, 29 Dec 2008 07:29:51 +0000 (08:29 +0100)
commit30e0dc28bff9dc456cdfc2aae4aca78b8b1a1cec
treecb72eba9e27bf893928189c832d29e97bbe132adtree | snapshot
parent31dcfab0ae6eb0340d456931df4d478e17efc65dcommit | diff
cfq-iosched: remove limit of dispatch depth of max 4 times quantum

This basically limits the hardware queue depth to 4*quantum at any
point in time, which is 16 with the default settings. As CFQ uses
other means to shrink the hardware queue when necessary in the first
place, there's really no need for this extra heuristic. Additionally,
it ends up hurting performance in some cases.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
block/cfq-iosched.c diff | blob | history
Domain: System / Kernel;