jacobpascual/openzfs-docs
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Document l2arc_meta_percent. (#47)

Browse Source 
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
This commit is contained in:
Alexander Motin
2020-08-26 11:38:39 -04:00
committed by GitHub
parent ceb02668a3
commit 2257242384
1 changed files with 29 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
docs/Performance and Tuning/ZFS on Linux Module Parameters.rst
View File

@@ -138,6 +138,7 @@ ARC
- `l2arc_feed_secs <#l2arc-feed-secs>`__
- `l2arc_headroom <#l2arc-headroom>`__
- `l2arc_headroom_boost <#l2arc-headroom-boost>`__
- `l2arc_meta_percent <#l2arc-meta-percent>`__
- `l2arc_nocompress <#l2arc-nocompress>`__
- `l2arc_noprefetch <#l2arc-noprefetch>`__
- `l2arc_norw <#l2arc-norw>`__
@@ -332,6 +333,7 @@ L2ARC
- `l2arc_feed_secs <#l2arc-feed-secs>`__
- `l2arc_headroom <#l2arc-headroom>`__
- `l2arc_headroom_boost <#l2arc-headroom-boost>`__
- `l2arc_meta_percent <#l2arc-meta-percent>`__
- `l2arc_nocompress <#l2arc-nocompress>`__
- `l2arc_noprefetch <#l2arc-noprefetch>`__
- `l2arc_norw <#l2arc-norw>`__
@@ -816,6 +818,7 @@ Index
- `l2arc_feed_secs <#l2arc-feed-secs>`__
- `l2arc_headroom <#l2arc-headroom>`__
- `l2arc_headroom_boost <#l2arc-headroom-boost>`__
- `l2arc_meta_percent <#l2arc-meta-percent>`__
- `l2arc_nocompress <#l2arc-nocompress>`__
- `l2arc_noprefetch <#l2arc-noprefetch>`__
- `l2arc_norw <#l2arc-norw>`__
@@ -1209,6 +1212,32 @@ legacy behavior of writing decompressed data to cache devices.
| | design |
+-------------------+-------------------------------------------------+
l2arc_meta_percent
~~~~~~~~~~~~~~~~~~
Percent of ARC size allowed for L2ARC-only headers.
Since L2ARC buffers are not evicted on memory pressure, too large amount of
headers on system with irrationaly large L2ARC can render it slow or unusable.
This parameter limits L2ARC writes and rebuild to achieve it.
+-------------------+-------------------------------------------------+
| l2arc_nocompress | Notes |
+===================+=================================================+
| Tags | `ARC <#arc>`__, `L2ARC <#l2arc>`__ |
+-------------------+-------------------------------------------------+
| When to change | When workload really require enormous L2ARC. |
+-------------------+-------------------------------------------------+
| Data Type | int |
+-------------------+-------------------------------------------------+
| Range | 0 to 100 |
+-------------------+-------------------------------------------------+
| Default | 33 |
+-------------------+-------------------------------------------------+
| Change | Dynamic |
+-------------------+-------------------------------------------------+
| Versions Affected | v2.0 and later |
+-------------------+-------------------------------------------------+
l2arc_noprefetch
~~~~~~~~~~~~~~~~