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