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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 Brian Behlendorf
parent 7ac732b8d6
commit c8d6a91a99
2 changed files with 2 additions and 2 deletions
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module/zfs/dmu.c
+1 -1
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@@ -71,7 +71,7 @@ int zfs_nopwrite_enabled = 1;
* will wait until the next TXG.
* A value of zero will disable this throttle.
*/
unsigned long zfs_per_txg_dirty_frees_percent = 5;
unsigned long zfs_per_txg_dirty_frees_percent = 30;
/*
* Enable/disable forcing txg sync when dirty checking for holes with lseek().