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Tony Nguyen 16f42e1b6d Use smaller default slack/delta value for schedule_hrtimeout_range() 
For interrupt coalescing, cv_timedwait_hires() uses a 100us slack/delta
for calls to schedule_hrtimeout_range(). This 100us slack can be costly
for small writes.

This change improves small write performance by passing resolution `res`
parameter to schedule_hrtimeout_range() to be used as delta/slack. A new
tunable `spl_schedule_hrtimeout_slack_us` is added to preserve old
behavior when desired.

Performance observations on 8K recordsize filesystem:
- 8K random writes at 1-64 threads, up to 60% improvement for one thread
  and smaller gains as thread count increases. At >64 threads, 2-5%
  decrease in performance was observed.
- 8K sequential writes, similar 60% improvement for one thread and
  leveling out around 64 threads. At >64 threads, 5-10% decrease in
  performance was observed.
- 128K sequential write sees 1-5 for the 128K. No observed regression at
  high thread count.

Testing done on Ubuntu 18.04 with 4.15 kernel, 8vCPUs and SSD storage on
VMware ESX.

Reviewed-by: Richard Elling <Richard.Elling@RichardElling.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matt Ahrens <mahrens@delphix.com>
Signed-off-by: Tony Nguyen <tony.nguyen@delphix.com>
Closes #9217
 		2020-01-22 13:48:58 -08:00
..
Makefile.in Retire unused spl_{mutex,rwlock}_{init_fini} 2019-09-25 11:27:49 -07:00
README.md Update build system and packaging 2018-05-29 16:00:33 -07:00
THIRDPARTYLICENSE.gplv2 Prepare SPL repo to merge with ZFS repo 2018-05-29 14:51:39 -07:00
THIRDPARTYLICENSE.gplv2.descrip Prepare SPL repo to merge with ZFS repo 2018-05-29 14:51:39 -07:00
spl-atomic.c Fix cstyle warnings 2018-02-07 11:49:38 -08:00
spl-condvar.c Use smaller default slack/delta value for schedule_hrtimeout_range() 2020-01-22 13:48:58 -08:00
spl-cred.c Fix cstyle warnings 2018-02-07 11:49:38 -08:00
spl-err.c Correct snprintf() size argument 2019-04-30 19:41:12 -07:00
spl-generic.c Retire unused spl_{mutex,rwlock}_{init_fini} 2019-09-25 11:27:49 -07:00
spl-kmem-cache.c Fix style of spl_kmem_cache_create() 2019-02-28 17:57:47 -08:00
spl-kmem.c Add missing __GFP_HIGHMEM flag to vmalloc 2019-09-25 11:27:49 -07:00
spl-kobj.c Fix cstyle warnings 2018-02-07 11:49:38 -08:00
spl-kstat.c Unbreak build on Linux kernel < 3.10 2019-04-08 14:59:24 -07:00
spl-proc.c Create /proc/sys/kernel/spl/gitrev with git hash 2018-10-08 21:57:02 -07:00
spl-procfs-list.c Restrict kstats and print real pointers 2019-04-04 18:57:06 -07:00
spl-taskq.c kernel timer API rework 2019-09-25 11:27:46 -07:00
spl-thread.c Minor style cleanup 2019-09-25 11:27:49 -07:00
spl-tsd.c Remove all spin_is_locked calls 2017-10-30 11:16:56 -07:00
spl-vmem.c Prepare SPL repo to merge with ZFS repo 2018-05-29 14:51:39 -07:00
spl-vnode.c Remove vn_set_fs_pwd()/vn_set_pwd() (no need to be at / during insmod) 2019-09-25 11:27:46 -07:00
spl-xdr.c Update build system and packaging 2018-05-29 16:00:33 -07:00
spl-zlib.c Drop KMC_NOEMERGENCY 2020-01-22 13:48:57 -08:00

README.md

The Solaris Porting Layer, SPL, is a Linux kernel module which provides a compatibility layer used by the ZFS on Linux project.

Installation

The latest version of the SPL is maintained as part of this repository. Only when building ZFS version 0.7.x or earlier must an external SPL release be used. These releases can be found at:

Release

The SPL is released under a GPLv2 license.
For more details see the NOTICE and THIRDPARTYLICENSE files; UCRL-CODE-235197