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Alexander Motin 05a7348a7e
RAIDZ: Use cache blocking during parity math
RAIDZ parity is calculated by adding data one column at a time.  It
works OK for small blocks, but for large blocks results of previous
addition may already be evicted from CPU caches to main memory, and
in addition to extra memory write require extra read to get it back.

This patch splits large parity operations into 64KB chunks, that
should in most cases fit into CPU L2 caches from the last decade.
I haven't touched more complicated cases of data reconstruction to
not over complicate the code.  Those should be relatively rare.

My tests on Xeon Gold 6242R CPU with 1MB of L2 cache per core show
up to 10/20% memory traffic reduction when writing to 4-wide RAIDZ/
RAIDZ2 blocks of ~4MB and up.  Older CPUs with 256KB of L2 cache
should see the effect even on smaller blocks.  Wider vdevs may need
bigger blocks to be affected.

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 #15448
2023-10-30 14:54:27 -07:00
.github Refine some details for the github actions update 2023-03-16 10:00:14 -07:00
cmd ZIO: Remove READY pipeline stage from root ZIOs 2023-10-25 15:22:25 -07:00
config config/zfs-build.m4: add Gentoo's bash-completion path 2023-10-09 12:50:06 -07:00
contrib contrib: debian: drop bashcompletion mangling after install 2023-10-02 17:06:41 -07:00
etc Revert "systemd: Use non-absolute paths in Exec* lines" 2023-06-07 11:14:05 -07:00
include RAIDZ: Use cache blocking during parity math 2023-10-30 14:54:27 -07:00
lib Add mutex_enter_interruptible() for interruptible sleeping IOCTLs 2023-10-26 09:17:40 -07:00
man arc_default_max on Linux should match FreeBSD 2023-10-26 09:13:01 -07:00
module RAIDZ: Use cache blocking during parity math 2023-10-30 14:54:27 -07:00
rpm spec: define _bashcompletiondir if undefined 2023-10-11 16:56:32 -07:00
scripts CI: Move perl script to dist_noinst_DATA 2023-10-10 13:31:15 -07:00
tests Revert "zvol: Temporally disable blk-mq" 2023-10-24 14:41:25 -07:00
udev Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
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.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 08:54:30 -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 08:54:30 -07:00
AUTHORS AUTHORS: update with missing names 2023-10-10 08:55:42 -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 Linux 6.5 compat: META (#15265) 2023-09-12 12:51:11 -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
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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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