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Alexander Motin 916384729e OpenZFS 8835 - Speculative prefetch in ZFS not working for misaligned reads 
In case of misaligned I/O sequential requests are not detected as such
due to overlaps in logical block sequence:

    dmu_zfetch(fffff80198dd0ae0, 27347, 9, 1)
    dmu_zfetch(fffff80198dd0ae0, 27355, 9, 1)
    dmu_zfetch(fffff80198dd0ae0, 27363, 9, 1)
    dmu_zfetch(fffff80198dd0ae0, 27371, 9, 1)
    dmu_zfetch(fffff80198dd0ae0, 27379, 9, 1)
    dmu_zfetch(fffff80198dd0ae0, 27387, 9, 1)

This patch makes single block overlap to be counted as a stream hit,
improving performance up to several times.

Authored by: Alexander Motin <mav@FreeBSD.org>
Approved by: Gordon Ross <gwr@nexenta.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Allan Jude <allanjude@freebsd.org>
Reviewed by: Gvozden Neskovic <neskovic@gmail.com>
Reviewed by: George Melikov <mail@gmelikov.ru>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/8835
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/aab6dd482a
Closes #7062
2018-01-19 09:31:29 -08:00
.github Reduce codecov PR comments 2018-01-09 11:15:55 -08:00
cmd OpenZFS 8652 - Tautological comparisons with ZPROP_INVAL 2018-01-19 09:22:37 -08:00
config Fix Debian packaging on ARMv7/ARM64 2018-01-18 10:15:41 -08:00
contrib Run zfs load-key if needed in dracut 2018-01-18 10:20:34 -08:00
etc Run zfs load-key if needed in dracut 2018-01-18 10:20:34 -08:00
include OpenZFS 8652 - Tautological comparisons with ZPROP_INVAL 2018-01-19 09:22:37 -08:00
lib OpenZFS 8652 - Tautological comparisons with ZPROP_INVAL 2018-01-19 09:22:37 -08:00
man OpenZFS 8959 - Add notifications when a scrub is paused or resumed 2018-01-17 10:31:00 -08:00
module OpenZFS 8835 - Speculative prefetch in ZFS not working for misaligned reads 2018-01-19 09:31:29 -08:00
rpm Force ztest to always use /dev/urandom 2018-01-12 09:36:26 -08:00
scripts Fix shellcheck v0.4.6 warnings 2018-01-17 10:17:16 -08:00
tests Fix shellcheck v0.4.6 warnings 2018-01-17 10:17:16 -08:00
udev Fix spelling 2017-01-03 11:31:18 -06:00
.gitignore Add configure option to enable gcov analysis 2017-09-15 10:24:13 -07:00
.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 Add a missing > to AUTHORS 2014-09-02 14:18:53 -07:00
autogen.sh build: do not call boilerplate ourself 2013-04-02 10:55:20 -07:00
configure.ac contrib/initramfs: switch to automake 2017-11-07 14:53:57 -08:00
copy-builtin Fix copy-builtin to work with ASAN patch 2018-01-12 09:39:36 -08:00
COPYRIGHT Encryption patch follow-up 2017-10-11 16:54:48 -04:00
DISCLAIMER Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
Makefile.am Update for cppcheck v1.80 2017-11-18 14:08:00 -08:00
META Tag zfs-0.7.0 2017-07-26 10:13:25 -07:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Add scan.coverity.com badge to README 2017-10-30 16:21:24 -07:00
TEST Refresh TEST file to include new variables 2017-11-08 11:09:30 -08:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.markdown

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.