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Brian Behlendorf b0319c1faa OpenZFS 7143 - dbuf_read() creates unnecessary zio_root() for bonus buf 
dbuf_read() creates a zio_root() to track and wait for all the
zio's that may happen as part of this call. However, if the blkptr_t
for this buffer is NULL or a hole, we will not create any more zio's,
so this zio_root() is unnecessary. This is always the case when calling
dbuf_read() on a bonus buffer, because it has no blkptr (it's part of
the containing dnode). For workloads that read a lot of bonus buffers
(e.g. file creation and removal), creating and destroying these
unnecessary zio's can decrease performance by around 3%.

The fix is to only create/destroy the zio_root() in dbuf_read() if
the blkptr is not NULL and not a hole.

Changes sponsored by Intel Corp.

Authored by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by:  Alex Zhuravlev <alexey.zhuravlev@intel.com>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue openzfs/openzfs#137
Closes #4803 
Closes #5382
2016-12-01 16:50:11 -07:00
cmd Do not force VDEV_NAME_TYPE_ID in max_width() 2016-11-30 17:46:16 -07:00
config Add -c to zpool iostat & status to run command 2016-11-29 14:45:38 -07:00
contrib Update .gitignore 2016-10-19 14:29:33 -07:00
etc Change /etc/mtab to /proc/self/mounts 2016-09-20 10:07:58 -07:00
include Remove unused sa_update_from_cb() 2016-12-01 16:39:06 -07:00
lib ABD optimized page allocation code 2016-11-29 14:34:33 -08:00
man Add -c to zpool iostat & status to run command 2016-11-29 14:45:38 -07:00
module OpenZFS 7143 - dbuf_read() creates unnecessary zio_root() for bonus buf 2016-12-01 16:50:11 -07:00
rpm Add -c to zpool iostat & status to run command 2016-11-29 14:45:38 -07:00
scripts Add paxcheck make lint target 2016-10-28 16:10:00 -07:00
tests Enable ro_props_001_pos 2016-11-30 11:27:04 -07:00
udev Allow partition aliases in vdev_id.conf (#5266) 2016-10-14 16:11:16 -07:00
.gitignore Update .gitignore 2016-10-19 14:29:33 -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 Add -c to zpool iostat & status to run command 2016-11-29 14:45:38 -07:00
copy-builtin Illumos Crypto Port module added to enable native encryption in zfs 2016-07-20 10:43:30 -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 Add paxcheck make lint target 2016-10-28 16:10:00 -07:00
META Tag 0.7.0-rc2 2016-10-26 10:36:33 -07:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
TEST Skip test suites on 32-bit TEST builders 2016-11-08 13:57:17 -08:00
zfs-script-config.sh.in Introduce tests for python scripts 2016-10-06 13:11:57 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.markdown

Native ZFS for Linux!

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.

Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org