Bring per_txg_dirty_frees_percent back to 30

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 <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Richard Yao <[email protected]> Reviewed-by: George Melikov <[email protected]> Signed-off-by: Mateusz Guzik <[email protected]> Closes #13932 Closes #13938
bsdjhb · Sep 28, 2022 · eb9bec0 · eb9bec0
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diff --git a/man/man4/zfs.4 b/man/man4/zfs.4
@@ -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.

diff --git a/module/zfs/dmu.c b/module/zfs/dmu.c
@@ -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().