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Jens Axboe 8e8320c931 blk-mq: fix performance regression with shared tags 
If we have shared tags enabled, then every IO completion will trigger
a full loop of every queue belonging to a tag set, and every hardware
queue for each of those queues, even if nothing needs to be done.
This causes a massive performance regression if you have a lot of
shared devices.

Instead of doing this huge full scan on every IO, add an atomic
counter to the main queue that tracks how many hardware queues have
been marked as needing a restart. With that, we can avoid looking for
restartable queues, if we don't have to.

Max reports that this restores performance. Before this patch, 4K
IOPS was limited to 22-23K IOPS. With the patch, we are running at
950-970K IOPS.

Fixes: 6d8c6c0f97 ("blk-mq: Restart a single queue if tag sets are shared")
Reported-by: Max Gurtovoy <maxg@mellanox.com>
Tested-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Tested-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2017-06-21 10:17:49 -06:00
..
partitions partitions/msdos: FreeBSD UFS2 file systems are not recognized 2017-05-23 09:16:07 -06:00
badblocks.c
bfq-cgroup.c block, bfq: access and cache blkg data only when safe 2017-06-08 09:51:10 -06:00
bfq-iosched.c block, bfq: access and cache blkg data only when safe 2017-06-08 09:51:10 -06:00
bfq-iosched.h block, bfq: access and cache blkg data only when safe 2017-06-08 09:51:10 -06:00
bfq-wf2q.c block, bfq: use pointer entity->sched_data only if set 2017-05-10 07:39:43 -06:00
bio-integrity.c bio-integrity: Do not allocate integrity context for bio w/o data 2017-06-03 07:36:27 -06:00
bio.c Merge branch 'md-next' into md-linus 2017-05-01 14:09:21 -07:00
blk-cgroup.c block: Avoid that blk_exit_rl() triggers a use-after-free 2017-06-01 13:07:55 -06:00
blk-core.c block: Avoid that blk_exit_rl() triggers a use-after-free 2017-06-01 13:07:55 -06:00
blk-exec.c block: remove the errors field from struct request 2017-04-20 12:16:10 -06:00
blk-flush.c block: make __blk_end_bidi_request private 2017-04-19 10:19:47 -06:00
blk-integrity.c block: fix blk_integrity_register to use template's interval_exp if not 0 2017-04-23 12:59:56 -06:00
blk-ioc.c
blk-lib.c
blk-map.c
blk-merge.c
blk-mq-cpumap.c
blk-mq-debugfs.c mq-deadline: add debugfs attributes 2017-05-04 08:25:17 -06:00
blk-mq-debugfs.h mq-deadline: add debugfs attributes 2017-05-04 08:25:17 -06:00
blk-mq-pci.c
blk-mq-sched.c blk-mq: fix performance regression with shared tags 2017-06-21 10:17:49 -06:00
blk-mq-sched.h blk-mq: fix performance regression with shared tags 2017-06-21 10:17:49 -06:00
blk-mq-sysfs.c blk-mq: untangle debugfs and sysfs 2017-05-04 08:24:13 -06:00
blk-mq-tag.c blk-mq: add shallow depth option for blk_mq_get_tag() 2017-04-14 14:06:54 -06:00
blk-mq-tag.h
blk-mq-virtio.c
blk-mq.c blk-mq: fix performance regression with shared tags 2017-06-21 10:17:49 -06:00
blk-mq.h blk-mq: move debugfs declarations to a separate header file 2017-05-04 08:23:44 -06:00
blk-settings.c
blk-softirq.c
blk-stat.c blk-stat: don't use this_cpu_ptr() in a preemptable section 2017-05-10 07:40:18 -06:00
blk-stat.h blk-stat: kill blk_stat_rq_ddir() 2017-04-21 07:56:23 -06:00
blk-sysfs.c block: Fix a blk_exit_rl() regression 2017-06-14 13:27:50 -06:00
blk-tag.c
blk-throttle.c blk-throttle: set default latency baseline for harddisk 2017-06-07 09:09:32 -06:00
blk-timeout.c block: remove the errors field from struct request 2017-04-20 12:16:10 -06:00
blk-wbt.c blk-stat: kill blk_stat_rq_ddir() 2017-04-21 07:56:23 -06:00
blk-wbt.h block: Make writeback throttling defaults consistent for SQ devices 2017-04-19 08:49:03 -06:00
blk-zoned.c
blk.h block: Avoid that blk_exit_rl() triggers a use-after-free 2017-06-01 13:07:55 -06:00
bounce.c
bsg-lib.c scsi: introduce a result field in struct scsi_request 2017-04-20 12:16:10 -06:00
bsg.c Merge branch 'work.uaccess' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-05-01 14:41:04 -07:00
cfq-iosched.c cfq-iosched: fix the delay of cfq_group's vdisktime under iops mode 2017-05-31 09:25:21 -06:00
cmdline-parser.c
compat_ioctl.c
deadline-iosched.c
elevator.c elevator: remove redundant warnings on IO scheduler switch 2017-05-10 07:40:04 -06:00
genhd.c A reasonably busy cycle for documentation this time around. There is a new 2017-05-02 10:21:17 -07:00
ioctl.c
ioprio.c block: Optimize ioprio_best() 2017-04-19 17:38:36 -06:00
Kconfig Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 2017-05-12 15:43:10 -07:00
Kconfig.iosched block, bfq: add full hierarchical scheduling and cgroups support 2017-04-19 08:30:26 -06:00
kyber-iosched.c kyber: add debugfs attributes 2017-05-04 08:25:17 -06:00
Makefile block, bfq: split bfq-iosched.c into multiple source files 2017-04-19 08:48:24 -06:00
mq-deadline.c mq-deadline: add debugfs attributes 2017-05-04 08:25:17 -06:00
noop-iosched.c
opal_proto.h
partition-generic.c block: fix an error code in add_partition() 2017-05-23 08:41:59 -06:00
scsi_ioctl.c scsi: introduce a result field in struct scsi_request 2017-04-20 12:16:10 -06:00
sed-opal.c
t10-pi.c