diff options
| author | Brian Behlendorf <[email protected]> | 2015-07-28 11:30:00 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2015-07-30 11:52:12 -0700 |
| commit | 7e8bddd01952722b8f8bda773b3c96cb49b2e2bc (patch) | |
| tree | 8cf73340385ce03104af185142788aca3f8e0b56 /man | |
| parent | 11f552fa9074a94dac3463300e369013ec2f1544 (diff) | |
Update arc_memory_throttle() to check pageout
This brings the behavior of arc_memory_throttle() back in sync with
illumos. The updated memory throttling policy roughly goes like this:
* Never throttle if more than 10% of memory is free. This threshold
is configurable with the zfs_arc_lotsfree_percent module option.
* Minimize any throttling of kswapd even when free memory is below
the set threshold. Allow it to write out pages as quickly as
possible to help alleviate the memory pressure.
* Delay all other threads when free memory is below the set threshold
in order to avoid compounding the memory pressure. Buffers will be
evicted from the ARC to reduce the issue.
The Linux specific zfs_arc_memory_throttle_disable module option has
been removed in favor of the existing zfs_arc_lotsfree_percent tuning.
Setting zfs_arc_lotsfree_percent=0 will have the same effect as
zfs_arc_memory_throttle_disable and it was therefore redundant.
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #3637
Diffstat (limited to 'man')
| -rw-r--r-- | man/man5/zfs-module-parameters.5 | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5 index c0365ea5c..de3f35bbb 100644 --- a/man/man5/zfs-module-parameters.5 +++ b/man/man5/zfs-module-parameters.5 @@ -388,23 +388,24 @@ Default value: \fB5\fR. .sp .ne 2 .na -\fBzfs_arc_max\fR (ulong) +\fBzfs_arc_lotsfree_percent\fR (int) .ad .RS 12n -Max arc size +Throttle I/O when free system memory drops below this percentage of total +system memory. Setting this value to 0 will disable the throttle. .sp -Default value: \fB0\fR. +Default value: \fB10\fR. .RE .sp .ne 2 .na -\fBzfs_arc_memory_throttle_disable\fR (int) +\fBzfs_arc_max\fR (ulong) .ad .RS 12n -Disable memory throttle +Max arc size .sp -Use \fB1\fR for yes (default) and \fB0\fR to disable. +Default value: \fB0\fR. .RE .sp |