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authorMatthew Ahrens <[email protected]>2017-12-12 15:46:58 -0800
committerBrian Behlendorf <[email protected]>2018-10-04 13:13:28 -0700
commitdfbe26750308d757d20af8eb5aefef49ec65d4a8 (patch)
treea06a369cecdbe4cd70627fbe44b9344cc95b7a29 /man/man5
parent58c0f374f101a37b5e1bb22359f40020f235e008 (diff)
OpenZFS 9617 - too-frequent TXG sync causes excessive write inflation
Porting notes: * Renamed zfs_dirty_data_sync_pct to zfs_dirty_data_sync_percent and changed the type to be consistent with the other dirty module params. * Updated zfs-module-parameters.5 accordingly. Authored by: Matthew Ahrens <[email protected]> Reviewed by: Serapheim Dimitropoulos <[email protected]> Reviewed by: Brad Lewis <[email protected]> Reviewed by: George Wilson <[email protected]> Reviewed by: Andrew Stormont <[email protected]> Reviewed-by: George Melikov <[email protected]> Approved by: Robert Mustacchi <[email protected]> Ported-by: Brian Behlendorf <[email protected]> OpenZFS-issue: https://illumos.org/issues/9617 OpenZFS-commit: https://github.com/openzfs/openzfs/commit/7928f4ba Closes #7976
Diffstat (limited to 'man/man5')
-rw-r--r--man/man5/zfs-module-parameters.58
1 files changed, 5 insertions, 3 deletions
diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5
index b02d6aae7..d7b53d161 100644
--- a/man/man5/zfs-module-parameters.5
+++ b/man/man5/zfs-module-parameters.5
@@ -1225,12 +1225,14 @@ Default value: \fB10\fR%, subject to \fBzfs_dirty_data_max_max\fR.
.sp
.ne 2
.na
-\fBzfs_dirty_data_sync\fR (int)
+\fBzfs_dirty_data_sync_percent\fR (int)
.ad
.RS 12n
-Start syncing out a transaction group if there is at least this much dirty data.
+Start syncing out a transaction group if there's at least this much dirty data
+as a percentage of \fBzfs_dirty_data_max\fR. This should be less than
+\fBzfs_vdev_async_write_active_min_dirty_percent\fR.
.sp
-Default value: \fB67,108,864\fR.
+Default value: \fB20\fR% of \fBzfs_dirty_data_max\fR.
.RE
.sp