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8a05aa4ce3
linux/drivers/block
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Ming Lei 8a05aa4ce3 mtip32xx: avoid to read HOST_CAP from HW in .queue_rq() 
It is observed reading the register from HW takes a bit long,
for example in my box, the following difference of 'perf report
--no-children fio ...' can be seen when running I/O:

1) V4.12 without patch
+    9.28%       fio  [mtip32xx]           [k] mtip_irq_handler
+    8.48%       fio  [mtip32xx]           [k] mtip_init_cmd_header

2) V4.12 with the following patch
+    9.14%       fio  [mtip32xx]           [k] mtip_irq_handler
......
+    1.14%       fio  [mtip32xx]           [k] mtip_init_cmd_header

IOPS can be increased by ~5% with this patch too.

Fixes: a4e84aae8139(mtip32xx: use runtime tag to initialize command header)
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2017-07-05 12:11:26 -06:00
..
aoe block: don't set bounce limit in blk_init_queue 2017-06-27 12:13:45 -06:00
drbd drbd: Drop unnecessary static 2017-06-27 17:56:50 -06:00
mtip32xx mtip32xx: avoid to read HOST_CAP from HW in .queue_rq() 2017-07-05 12:11:26 -06:00
paride block: don't set bounce limit in blk_init_queue 2017-06-27 12:13:45 -06:00
rsxx block: don't bother with bounce limits for make_request drivers 2017-06-27 12:13:45 -06:00
xen-blkback Merge commit '8e8320c9315c' into for-4.13/block 2017-06-22 21:55:24 -06:00
zram zram: reduce load operation in page_same_filled 2017-05-03 15:52:11 -07:00
amiflop.c block: introduce new block status code type 2017-06-09 09:27:32 -06:00
ataflop.c block: introduce new block status code type 2017-06-09 09:27:32 -06:00
brd.c block: don't bother with bounce limits for make_request drivers 2017-06-27 12:13:45 -06:00
cciss_cmd.h
cciss_scsi.c cciss: Remove kmalloc cast 2017-02-22 11:54:49 -07:00
cciss_scsi.h
cciss.c block: introduce new block status code type 2017-06-09 09:27:32 -06:00
cciss.h SCSI misc on 20170220 2017-02-21 11:51:42 -08:00
cryptoloop.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
DAC960.c block: introduce new block status code type 2017-06-09 09:27:32 -06:00
DAC960.h
floppy.c block: don't set bounce limit in blk_init_queue 2017-06-27 12:13:45 -06:00
Kconfig libnvdimm for 4.12 2017-05-05 18:49:20 -07:00
loop.c loop: Add PF_LESS_THROTTLE to block/loop device thread. 2017-06-18 09:07:42 -06:00
loop.h loop: support 4k physical blocksize 2017-06-08 08:40:00 -06:00
Makefile block: remove the osdblk driver 2017-04-19 09:10:51 -06:00
nbd.c Linux 4.12-rc5 2017-06-12 08:30:13 -06:00
null_blk.c null_blk: add support for shared tags 2017-06-20 14:22:01 -06:00
pktcdvd.c pktcdvd: remove the call to blk_queue_bounce 2017-06-27 12:12:14 -06:00
ps3disk.c block: introduce new block status code type 2017-06-09 09:27:32 -06:00
ps3vram.c blk: remove bio_set arg from blk_queue_split() 2017-06-18 12:40:59 -06:00
rbd_types.h rbd: RBD_V{1,2}_DATA_FORMAT macros 2017-02-20 12:16:15 +01:00
rbd.c rbd: use bio_clone_fast() instead of bio_clone() 2017-06-18 12:40:59 -06:00
skd_main.c block: don't set bounce limit in blk_init_queue 2017-06-27 12:13:45 -06:00
skd_s1120.h
smart1,2.h
sunvdc.c block: introduce new block status code type 2017-06-09 09:27:32 -06:00
swim3.c block: don't set bounce limit in blk_init_queue 2017-06-27 12:13:45 -06:00
swim_asm.S
swim.c block: don't set bounce limit in blk_init_queue 2017-06-27 12:13:45 -06:00
sx8.c block: introduce new block status code type 2017-06-09 09:27:32 -06:00
umem.c blk: remove bio_set arg from blk_queue_split() 2017-06-18 12:40:59 -06:00
umem.h
virtio_blk.c blk-mq: don't bounce by default 2017-06-27 12:13:45 -06:00
xen-blkfront.c blk-mq: don't bounce by default 2017-06-27 12:13:45 -06:00
xsysace.c block: don't set bounce limit in blk_init_queue 2017-06-27 12:13:45 -06:00
z2ram.c block: introduce new block status code type 2017-06-09 09:27:32 -06:00