Jens Axboe a993800655 cfq-iosched: fix sequential write regression ... We have a 10-15% performance regression for sequential writes on TCQ/NCQ enabled drives in 2.6.21-rcX after the CFQ update went in. It has been reported by Valerie Clement <valerie.clement@bull.net> and the Intel testing folks. The regression is because of CFQ's now more aggressive queue control, limiting the depth available to the device. This patches fixes that regression by allowing a greater depth when only one queue is busy. It has been tested to not impact sync-vs-async workloads too much - we still do a lot better than 2.6.20. Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2007-04-20 22:56:29 -07:00
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Kconfig	…
Kconfig.iosched	…
Makefile	…
as-iosched.c	…
blktrace.c	…
cfq-iosched.c	cfq-iosched: fix sequential write regression	2007-04-20 22:56:29 -07:00
deadline-iosched.c	…
elevator.c	make elv_register() output atomic	2007-03-27 08:53:04 +02:00
genhd.c	[PATCH] remove protection of LANANA-reserved majors	2007-04-04 21:12:47 -07:00
ioctl.c	…
ll_rw_blk.c	…
noop-iosched.c	…
scsi_ioctl.c	…