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Richard Yao bc17f1047a Enable Linux read-ahead for a single page on ZVOLs 
Linux has read-ahead logic designed to accelerate sequential workloads.
ZFS has its own read-ahead logic called zprefetch that operates on both
ZVOLs and datasets. Having two prefetchers active at the same time can
cause overprefetching, which unnecessarily reduces IOPS performance on
CoW filesystems like ZFS.

Testing shows that entirely disabling the Linux prefetch results in
a significant performance penalty for reads while commensurate benefits
are seen in random writes. It appears that read-ahead benefits are
inversely proportional to random write benefits, and so a single page
of Linux-layer read-ahead appears to offer the middle ground for both
workloads.

Reviewed-by: Chunwei Chen <david.chen@osnexus.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <ryao@gentoo.org>
Issue #5902
2017-05-04 18:00:27 -04:00
.github Commit message format in contributing guidelines 2017-03-31 09:33:38 -07:00
cmd More ashift improvements 2017-05-03 09:31:05 -07:00
config Enable Linux read-ahead for a single page on ZVOLs 2017-05-04 18:00:27 -04:00
contrib Fix initramfs hook for merged /usr/lib and /lib 2017-02-27 12:03:23 -08:00
etc OpenZFS 7793 - ztest fails assertion in dmu_tx_willuse_space 2017-03-07 09:51:59 -08:00
include Enable Linux read-ahead for a single page on ZVOLs 2017-05-04 18:00:27 -04:00
lib More ashift improvements 2017-05-03 09:31:05 -07:00
man More ashift improvements 2017-05-03 09:31:05 -07:00
module Enable Linux read-ahead for a single page on ZVOLs 2017-05-04 18:00:27 -04:00
rpm Prebaked scripts for zpool status/iostat -c 2017-04-21 09:27:04 -07:00
scripts OpenZFS 7503 - zfs-test should tail ::zfs_dbgmsg on test failure 2017-04-12 13:36:48 -07:00
tests Update rsend_014_pos and send-c_volume test cases 2017-05-04 14:32:43 -07:00
udev Fix spelling 2017-01-03 11:31:18 -06:00
.gitignore OpenZFS 7290 - ZFS test suite needs to control what utilities it can run 2017-04-06 09:25:36 -07:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -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 OpenZFS 7503 - zfs-test should tail ::zfs_dbgmsg on test failure 2017-04-12 13:36:48 -07:00
copy-builtin Allow c99 when building ZFS in the kernel tree 2017-03-27 12:31:15 -07:00
COPYRIGHT Update ZED copyright boilerplate 2015-05-11 15:07:00 -07:00
DISCLAIMER Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
Makefile.am Prebaked scripts for zpool status/iostat -c 2017-04-21 09:27:04 -07:00
META Tag 0.7.0-rc3 2017-01-20 10:18:28 -08:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Add CONTRIBUTING information and templates 2016-12-09 12:48:12 -07:00
TEST Skip xfstests on Amazon Linux 2017-04-06 17:15:30 -07:00
zfs-script-config.sh.in Prebaked scripts for zpool status/iostat -c 2017-04-21 09:27:04 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.markdown

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

ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers. And it's native!

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.