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Bring per_txg_dirty_frees_percent back to 30

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The current value causes significant artificial slowdown during mass
parallel file removal, which can be observed both on FreeBSD and Linux
when running real workloads.

Sample results from Linux doing make -j 96 clean after an allyesconfig
modules build:

before: 4.14s user 6.79s system 48% cpu 22.631 total
after:	4.17s user 6.44s system 153% cpu 6.927 total

FreeBSD results in the ticket.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by:	Mateusz Guzik <mjguzik@gmail.com>
Closes #13932
Closes #13938
This commit is contained in:
Mateusz Guzik 2022-09-28 02:38:03 +02:00 committed by GitHub
parent af65073a07
commit eb9bec0a5d
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2 changed files with 2 additions and 2 deletions
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2
man/man4/zfs.4
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@ -1677,7 +1677,7 @@ prefetched during a pool traversal, like
.Nm zfs Cm send
or other data crawling operations.
.
.It Sy zfs_per_txg_dirty_frees_percent Ns = Ns Sy 5 Ns % Pq ulong
.It Sy zfs_per_txg_dirty_frees_percent Ns = Ns Sy 30 Ns % Pq ulong
Control percentage of dirtied indirect blocks from frees allowed into one TXG.
After this threshold is crossed, additional frees will wait until the next TXG.
.Sy 0 No disables this throttle.

2
module/zfs/dmu.c
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@ -70,7 +70,7 @@ static int zfs_nopwrite_enabled = 1;
* will wait until the next TXG.
* A value of zero will disable this throttle.
*/
static unsigned long zfs_per_txg_dirty_frees_percent = 5;
static unsigned long zfs_per_txg_dirty_frees_percent = 30;
/*
* Enable/disable forcing txg sync when dirty checking for holes with lseek().