Shaohua Li abc3c744d0 cfq-iosched: quantum check tweak ...

Currently a queue can only dispatch up to 4 requests if there are other queues.
This isn't optimal, device can handle more requests, for example, AHCI can
handle 31 requests. I can understand the limit is for fairness, but we could
do a tweak: if the queue still has a lot of slice left, sounds we could
ignore the limit. Test shows this boost my workload (two thread randread of
a SSD) from 78m/s to 100m/s.
Thanks for suggestions from Corrado and Vivek for the patch.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

2010-03-01 09:20:54 +01:00

..

blk-barrier.c

block: Honor the gfp_mask for alloc_page() in blkdev_issue_discard()

2009-12-29 08:53:54 +01:00

blk-cgroup.c

cfq: Remove useless css reference get

2010-02-26 08:56:15 +01:00

blk-cgroup.h

cfq: Remove useless css reference get

2010-02-26 08:56:15 +01:00

blk-core.c

block: Consolidate phys_segment and hw_segment limits

2010-02-26 13:58:08 +01:00

blk-exec.c

block: don't set REQ_NOMERGE unnecessarily

2009-04-28 07:37:33 +02:00

blk-integrity.c

block: fix improper kobject release in blk_integrity_unregister

2009-07-28 09:11:14 +02:00

blk-ioc.c

block: removed unused as_io_context

2010-01-11 14:29:20 +01:00

blk-iopoll.c

tree-wide: fix assorted typos all over the place

2009-12-04 15:39:55 +01:00

blk-map.c

block: Use accessor functions for queue limits

2009-05-22 23:22:54 +02:00

blk-merge.c

block: Consolidate phys_segment and hw_segment limits

2010-02-26 13:58:08 +01:00

blk-settings.c

block: Consolidate phys_segment and hw_segment limits

2010-02-26 13:58:08 +01:00

blk-softirq.c

generic-ipi: remove CSD_FLAG_WAIT

2009-02-25 14:13:44 +01:00

blk-sysfs.c

block: Added in stricter no merge semantics for block I/O

2010-01-29 09:04:08 +01:00

blk-tag.c

block: use proper BLK_RW_ASYNC in blk_queue_start_tag()

2009-10-06 20:19:02 +02:00

blk-timeout.c

block: clean up misc stuff after block layer timeout conversion

2009-04-28 07:37:34 +02:00

blk.h

block: implement mixed merge of different failfast requests

2009-09-11 14:33:30 +02:00

bsg.c

block: jiffies fixes

2009-11-11 13:47:45 +01:00

cfq-iosched.c

cfq-iosched: quantum check tweak

2010-03-01 09:20:54 +01:00

compat_ioctl.c

block: Allow devices to indicate whether discarded blocks are zeroed

2009-12-03 09:24:48 +01:00

deadline-iosched.c

block: convert to pos and nr_sectors accessors

2009-05-11 09:50:54 +02:00

elevator.c

block: Added in stricter no merge semantics for block I/O

2010-01-29 09:04:08 +01:00

genhd.c

block: Fix discard alignment calculation and printing

2010-01-11 14:29:19 +01:00

ioctl.c

block: Allow devices to indicate whether discarded blocks are zeroed

2009-12-03 09:24:48 +01:00

Kconfig

blkio: Some debugging aids for CFQ

2009-12-03 19:28:52 +01:00

Kconfig.iosched

blkio: Allow CFQ group IO scheduling even when CFQ is a module

2009-12-04 16:38:14 +01:00

Makefile

blkio: Introduce blkio controller cgroup interface

2009-12-03 19:28:51 +01:00

noop-iosched.c

block: get rid of elevator_t typedef

2008-12-29 08:29:50 +01:00

scsi_ioctl.c

block/scsi_ioctl.c: quiet sparse noise

2009-11-04 09:10:33 +01:00