Paolo Valente 43c1b3d6e5 block, bfq: stress that low_latency must be off to get max throughput ... The introduction of the BFQ and Kyber I/O schedulers has triggered a new wave of I/O benchmarks. Unfortunately, comments and discussions on these benchmarks confirm that there is still little awareness that it is very hard to achieve, at the same time, a low latency and a high throughput. In particular, virtually all benchmarks measure throughput, or throughput-related figures of merit, but, for BFQ, they use the scheduler in its default configuration. This configuration is geared, instead, toward a low latency. This is evidently a sign that BFQ documentation is still too unclear on this important aspect. This commit addresses this issue by stressing how BFQ configuration must be (easily) changed if the only goal is maximum throughput. Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Jens Axboe <axboe@fb.com>		2017-05-10 07:39:43 -06:00
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partitions	partitions/efi: Fix integer overflow in GPT size calculation	2017-01-17 09:02:31 -07:00
Kconfig	libnvdimm for 4.12	2017-05-05 18:49:20 -07:00
Kconfig.iosched	block, bfq: add full hierarchical scheduling and cgroups support	2017-04-19 08:30:26 -06:00
Makefile	block, bfq: split bfq-iosched.c into multiple source files	2017-04-19 08:48:24 -06:00
badblocks.c	badblocks: badblocks_set/clear update unacked_exist	2016-10-21 15:45:47 -06:00
bfq-cgroup.c	block, bfq: split bfq-iosched.c into multiple source files	2017-04-19 08:48:24 -06:00
bfq-iosched.c	block, bfq: stress that low_latency must be off to get max throughput	2017-05-10 07:39:43 -06:00
bfq-iosched.h	bfq: fix compile error if CONFIG_CGROUPS=n	2017-04-20 09:39:12 -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	block: remove bio_is_rw	2016-10-28 08:45:17 -06:00
bio.c	Merge branch 'md-next' into md-linus	2017-05-01 14:09:21 -07:00
blk-cgroup.c	blkcg: allocate struct blkcg_gq outside request queue spinlock	2017-03-29 11:27:19 -06:00
blk-core.c	blk-mq: untangle debugfs and sysfs	2017-05-04 08:24:13 -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	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2017-03-03 10:53:35 -08:00
blk-lib.c	block: remove the discard_zeroes_data flag	2017-04-08 11:25:38 -06:00
blk-map.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
blk-merge.c	block: implement splitting of REQ_OP_WRITE_ZEROES bios	2017-04-08 11:25:38 -06:00
blk-mq-cpumap.c	blk-mq: export blk_mq_map_queues	2016-11-08 17:30:00 -05:00
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-pci: Fix two spelling mistakes	2017-03-29 11:09:51 -06:00
blk-mq-sched.c	blk-mq-debugfs: allow schedulers to register debugfs attributes	2017-05-04 08:24:40 -06:00
blk-mq-sched.h	blk-mq: Remove blk_mq_sched_move_to_dispatch()	2017-04-20 17:28:30 -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-sched: Allocate sched reserved tags as specified in the original queue tagset	2017-03-02 08:56:04 -07:00
blk-mq-virtio.c	blk-mq: provide a default queue mapping for virtio device	2017-02-27 20:54:05 +02:00
blk-mq.c	blk-mq: make __blk_mq_stop_hw_queues static	2017-05-08 08:09:39 -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	block: remove the discard_zeroes_data flag	2017-04-08 11:25:38 -06:00
blk-softirq.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/topology.h>	2017-03-02 08:42:26 +01:00
blk-stat.c	blk-stat: kill blk_stat_rq_ddir()	2017-04-21 07:56:23 -06:00
blk-stat.h	blk-stat: kill blk_stat_rq_ddir()	2017-04-21 07:56:23 -06:00
blk-sysfs.c	blk-mq: untangle debugfs and sysfs	2017-05-04 08:24:13 -06:00
blk-tag.c	blk-mq-sched: add framework for MQ capable IO schedulers	2017-01-17 10:04:20 -07:00
blk-throttle.c	blk-throttle: fix unused variable warning with BLK_DEV_THROTTLING_LOW=n	2017-04-20 09:41:36 -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	block: Rename blk_queue_zone_size and bdev_zone_size	2017-01-12 07:58:32 -07:00
blk.h	block: Export blk_init_request_from_bio()	2017-04-19 17:38:30 -06:00
bounce.c	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2015-09-19 18:57:09 -07:00
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: Disable writeback throttling by default	2017-04-05 08:15:08 -06:00
cmdline-parser.c	block: remove unrelated header files and export symbol	2014-01-21 20:18:26 -08:00
compat_ioctl.c	block: remove the discard_zeroes_data flag	2017-04-08 11:25:38 -06:00
deadline-iosched.c	block: enumify ELEVATOR_*_MERGE	2017-02-08 13:43:06 -07:00
elevator.c	block: don't call blk_mq_quiesce_queue() after queue is frozen	2017-05-02 11:33:08 -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	block: remove the discard_zeroes_data flag	2017-04-08 11:25:38 -06:00
ioprio.c	block: Optimize ioprio_best()	2017-04-19 17:38:36 -06:00
kyber-iosched.c	kyber: add debugfs attributes	2017-05-04 08:25:17 -06:00
mq-deadline.c	mq-deadline: add debugfs attributes	2017-05-04 08:25:17 -06:00
noop-iosched.c	block: move existing elevator ops to union	2017-01-17 10:03:33 -07:00
opal_proto.h	block/sed-opal: allocate struct opal_dev dynamically	2017-02-17 12:41:47 -07:00
partition-generic.c	libnvdimm for 4.12	2017-05-05 18:49:20 -07:00
scsi_ioctl.c	scsi: introduce a result field in struct scsi_request	2017-04-20 12:16:10 -06:00
sed-opal.c	block: sed-opal: Tone down all the pr_* to debugs	2017-04-07 14:24:16 -06:00
t10-pi.c	block: constify struct blk_integrity_profile	2017-03-24 20:34:39 -06:00