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Alexander Motin edaec84225 Improve logging of 128KB writes 
Before my ZIL space optimization few years ago 128KB writes were logged
as two 64KB+ records in two 128KB log blocks.  After that change it
became ~127KB+/1KB+ in two 128KB log blocks to free space in the second
block for another record.  Unfortunately in case of 128KB only writes,
when space in the second block remained unused, that change increased
write latency by unbalancing checksum computation and write times
between parallel threads.  It also didn't help with SLOG space
efficiency in that case.

This change introduces new 68KB log block size, used for both writes
below 67KB and 128KB-sharp writes.  Writes of 68-127KB are still using
one 128KB block to not increase processing overhead.  Writes above
131KB are still using full 128KB blocks, since possible saving there
is small.  Mixed loads will likely also fall back to previous 128KB,
since code uses maximum of the last 16 requested block sizes.

Reviewed-by: Matt Ahrens <matt@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:  Alexander Motin <mav@FreeBSD.org>
Closes #9409
2020-01-22 13:49:04 -08:00
.github Fix typos 2020-01-22 13:49:00 -08:00
cmd Fix zpool history unbounded memory usage 2020-01-22 13:49:03 -08:00
config Perform KABI checks in parallel 2020-01-22 13:49:01 -08:00
contrib Skip loading already loaded key 2020-01-22 13:49:03 -08:00
etc Skip loading already loaded key 2020-01-22 13:49:03 -08:00
include Fix zpool history unbounded memory usage 2020-01-22 13:49:03 -08:00
lib Fix zpool history unbounded memory usage 2020-01-22 13:49:03 -08:00
man Modify sharenfs=on default behavior 2020-01-22 13:49:03 -08:00
module Improve logging of 128KB writes 2020-01-22 13:49:04 -08:00
rpm Canonicalize Python shebangs 2020-01-22 13:49:00 -08:00
scripts Fix typos 2020-01-22 13:49:00 -08:00
tests Fix 'zfs change-key' with unencrypted child 2020-01-22 13:49:03 -08:00
udev Add enclosure_symlinks option to vdev_id 2018-12-14 17:27:49 -08:00
.gitignore Perform KABI checks in parallel 2020-01-22 13:49:01 -08:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
.travis.yml Add .travis.yml 2017-11-13 09:18:18 -08:00
AUTHORS Update build system and packaging 2018-05-29 16:00:33 -07:00
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
CODE_OF_CONDUCT.md Add CODE_OF_CONDUCT.md 2019-04-30 10:58:45 -07:00
configure.ac Add channel program for property based snapshots 2020-01-22 13:48:57 -08:00
copy-builtin Allow copy-builtin to work with modified sources 2018-10-17 12:06:05 -07:00
COPYRIGHT Update build system and packaging 2018-05-29 16:00:33 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am Perform KABI checks in parallel 2020-01-22 13:49:01 -08:00
META Tag zfs-0.8.2 2019-09-25 11:27:51 -07:00
NEWS Add NEWS file 2018-09-18 12:03:47 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md Explicitly state supported Linux versions 2018-05-30 20:11:19 -07:00
TEST Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.md

img

ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.

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Official Resources

Installation

Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.

Contribute & Develop

We have a separate document with contribution guidelines.

Release

ZFS on Linux is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported kernel versions.