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Let default arc_c_max be platform dependent

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Linux changed the default max ARC size to 1/2 of physical memory to
deal with shortcomings of the Linux SLUB allocator.  Other platforms
do not require the same logic.

Implement an arc_default_max() function to determine a default max ARC
size in platform code.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #10155
This commit is contained in:
Ryan Moeller
2020-03-27 12:14:46 -04:00
committed by GitHub
parent 3f38797338
commit 9a51738b60
4 changed files with 22 additions and 8 deletions
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man/man5/zfs-module-parameters.5
+5 -2
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@@ -854,8 +854,11 @@ Default value: \fB10\fR%.
\fBzfs_arc_max\fR (ulong)
.ad
.RS 12n
Max arc size of ARC in bytes. If set to 0 then it will consume 1/2 of system
RAM. This value must be at least 67108864 (64 megabytes).
Max size of ARC in bytes. If set to 0 then the max size of ARC is determined
by the amount of system memory installed. For Linux, 1/2 of system memory will
be used as the limit. For FreeBSD, the larger of all system memory - 1GB or
5/8 of system memory will be used as the limit. This value must be at least
67108864 (64 megabytes).
.sp
This value can be changed dynamically with some caveats. It cannot be set back
to 0 while running and reducing it below the current ARC size will not cause