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Illumos 5034 - ARC's buf_hash_table is too small

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5034 ARC's buf_hash_table is too small

Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com>
Reviewed by: Richard Elling <richard.elling@gmail.com>
Approved by: Gordon Ross <gwr@nexenta.com>

References:
  https://www.illumos.org/issues/5034
  https://github.com/illumos/illumos-gate/commit/63e911b

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2615
This commit is contained in:
Matthew Ahrens
2014-08-20 10:09:40 -07:00
committed by Brian Behlendorf
parent d09a99f96b
commit 49ddb31506
2 changed files with 26 additions and 3 deletions
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man/man5/zfs-module-parameters.5
+16
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@@ -274,6 +274,22 @@ Min time before an active prefetch stream can be reclaimed
Default value: \fB2\fR.
.RE
.sp
.ne 2
.na
\fBzfs_arc_average_blocksize\fR (int)
.ad
.RS 12n
The ARC's buffer hash table is sized based on the assumption of an average
block size of \fBzfs_arc_average_blocksize\fR (default 8K). This works out
to roughly 1MB of hash table per 1GB of physical memory with 8-byte pointers.
For configurations with a known larger average block size this value can be
increased to reduce the memory footprint.
.sp
Default value: \fB8192\fR.
.RE
.sp
.ne 2
.na