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Alexander Motin e82e68400a DMU: Do not pre-read holes during write
dmu_tx_check_ioerr() pre-reads blocks that are going to be dirtied
as part of transaction to both prefetch them and check for errors.
But it makes no sense to do it for holes, since there are no disk
reads to prefetch and there can be no errors.  On the other side
those blocks are anonymous, and they are freed immediately by the
dbuf_rele() without even being put into dbuf cache, so we just
burn CPU time on decompression and overheads and get absolutely
no result at the end.

Use of dbuf_hold_impl() with fail_sparse parameter allows to skip
the extra work, and on my tests with sequential 8KB writes to empty
ZVOL with 32KB blocks shows throughput increase from 1.7 to 2GB/s.

Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15371
2023-11-08 12:15:41 -08:00
.github Refine some details for the github actions update 2023-03-16 10:00:14 -07:00
cmd "ARC prefetch metadata accesses:" appears twice in the output. 2023-11-06 16:47:14 -08:00
config Linux 6.6 compat: fsync_bdev() has been removed in favor of sync_blockdev() 2023-11-08 12:15:41 -08:00
contrib Add zfs_prepare_disk script for disk firmware install 2023-11-06 16:45:07 -08:00
etc Revert "systemd: Use non-absolute paths in Exec* lines" 2023-06-07 11:14:05 -07:00
include Linux 6.6 compat: generic_fillattr has a new u32 request_mask added at arg2 2023-11-08 12:15:41 -08:00
lib Add mutex_enter_interruptible() for interruptible sleeping IOCTLs 2023-11-06 16:47:41 -08:00
man Revert "zvol: Temporally disable blk-mq" 2023-11-06 16:47:32 -08:00
module DMU: Do not pre-read holes during write 2023-11-08 12:15:41 -08:00
rpm spec: define _bashcompletiondir if undefined 2023-10-11 16:58:06 -07:00
scripts Add zfs_prepare_disk script for disk firmware install 2023-11-06 16:45:07 -08:00
tests Revert "zvol: Temporally disable blk-mq" 2023-11-06 16:47:32 -08:00
udev Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
.cirrus.yml CI: add FreeBSD build with Cirrus CI 2023-10-07 09:08:20 -07:00
.editorconfig Add an .editorconfig; document git whitespace settings 2020-01-27 13:32:52 -08:00
.gitignore mailmap: initial, trying to tidy up a lot of the commit history 2023-10-10 19:19:09 -07:00
.gitmodules .gitmodules: link to openzfs github repository 2021-04-12 09:37:23 -07:00
.mailmap mailmap: initial, trying to tidy up a lot of the commit history 2023-10-10 19:19:09 -07:00
AUTHORS AUTHORS: update with missing names 2023-10-10 19:19:09 -07:00
autogen.sh Ubuntu 22.04 integration: ShellCheck 2022-11-18 11:24:48 -08:00
CODE_OF_CONDUCT.md Documentation corrections 2022-12-22 11:34:28 -08:00
configure.ac Add native-deb* targets to build native Debian packages 2022-12-13 17:33:05 -08:00
copy-builtin copy-builtin: add hooks with sed/>> 2022-05-10 10:17:43 -07:00
COPYRIGHT Fix typos 2020-06-09 21:24:09 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am Process script directory for all configs 2022-10-27 16:45:14 -07:00
META Tag 2.2.0 2023-10-12 16:19:17 -07:00
NEWS Fix NEWS file 2020-08-26 21:44:41 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md README: Update OpenZFS website url 2022-01-06 16:25:01 -08:00
RELEASES.md Add RELEASES.md file 2021-04-02 16:33:40 -07:00
TEST Remove CI builder customization from TEST 2020-03-16 10:46:03 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS 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 Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 12.2-RELEASE.