Alexander Motin 916d9de158 Reduce ZIO io_lock contention on sorted scrub ... During sorted scrub multiple threads (one per vdev) are issuing many ZIOs same time, all using the same scn->scn_zio_root ZIO as parent. It causes huge lock contention on the single global lock on that ZIO. Improve it by introducing per-queue null ZIOs, children to that one, and using them instead as proxy. For 12 SSD pool storing 1.5TB of 4KB blocks on 80-core system this dramatically reduces lock contention and reduces scrub time from 21 minutes down to 12.5, while actual read stages (not scan) are about 3x faster, reaching 100K blocks per second per vdev. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #13553		2022-07-26 10:10:37 -07:00
..
avl	AVL: Remove obsolete branching optimizations	2022-07-26 10:10:37 -07:00
icp	Fix functions without a prototype	2022-05-20 10:33:24 -07:00
lua	Use fallthrough macro	2021-11-02 09:50:30 -07:00
nvpair	Update checkstyle workflow env to ubuntu-20.04	2021-12-08 13:27:56 -08:00
os	Avoid small buffer copying on write	2022-07-26 10:10:37 -07:00
spl	Cleanup linux module kbuild files	2020-06-10 09:24:15 -07:00
unicode	Update checkstyle workflow env to ubuntu-20.04	2021-12-08 13:27:56 -08:00
zcommon	Linux 5.16 compat: don't use XSTATE_XSAVE to save FPU state	2022-02-16 17:58:55 -08:00
zfs	Reduce ZIO io_lock contention on sorted scrub	2022-07-26 10:10:37 -07:00
zstd	module: zstd: check we don't leak symbols; regenerate symbol map	2022-05-16 15:48:21 -07:00
.gitignore	Cleanup linux module kbuild files	2020-06-10 09:24:15 -07:00
Kbuild.in	Add zstd support to zfs	2020-08-20 10:30:06 -07:00
Makefile.bsd	FreeBSD: Silence clang unused-but-set-variable	2022-06-15 11:27:28 -07:00
Makefile.in	Add support for $KERNEL_{CC,LD,LLVM} variables	2022-02-16 17:58:55 -08:00