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OpenZFS 9617 - too-frequent TXG sync causes excessive write inflation

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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 <mahrens@delphix.com>
Reviewed by: Serapheim Dimitropoulos <serapheim.dimitro@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Andrew Stormont <andyjstormont@gmail.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://illumos.org/issues/9617
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/7928f4ba
Closes #7976
This commit is contained in:
Matthew Ahrens
2017-12-12 15:46:58 -08:00
committed by Brian Behlendorf
parent 58c0f374f1
commit dfbe267503
4 changed files with 18 additions and 11 deletions
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man/man5/zfs-module-parameters.5
+5 -3
View File
@@ -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