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
..
as-iosched.c	[PATCH] Allow as-iosched to be unloaded	2006-12-13 13:25:18 +01:00
blktrace.c	[PATCH] mark struct file_operations const 3	2007-02-12 09:48:45 -08:00
cfq-iosched.c	cfq-iosched: fix sequential write regression	2007-04-20 22:56:29 -07:00
deadline-iosched.c	[BLOCK] Cleanup unused variable passing	2006-12-01 10:42:33 +01:00
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	[PATCH] lockdep: annotate BLKPG_DEL_PARTITION	2007-02-20 17:10:16 -08:00
Kconfig	[PATCH] Centralise definitions of sector_t and blkcnt_t	2006-12-04 19:41:15 -08:00
Kconfig.iosched	update I/O sched Kconfig help texts - CFQ is now default, not AS.	2007-02-17 20:08:22 +01:00
ll_rw_blk.c	block: blk_max_pfn is somtimes wrong	2007-03-27 08:52:47 +02:00
Makefile	[PATCH] BLOCK: Make it possible to disable the block layer [try #6]	2006-09-30 20:52:31 +02:00
noop-iosched.c	[BLOCK] Cleanup unused variable passing	2006-12-01 10:42:33 +01:00
scsi_ioctl.c	[PATCH] Fix SG_IO timeout jiffy conversion	2007-01-29 20:32:03 -08:00