https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235543
Bug ID: 235543
Summary: 19.6.1. Tuning: Inaccurate description of
vfs.zfs.arc_max
Product: Documentation
Version: Latest
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: Documentation
Assignee: [email protected]
Reporter: [email protected]
The description of the default value for vfs.zfs.arc_max in the handbook
(section 19.6.1.) is inaccurate. I propose phrasing it as follows:
"The default is all RAM but 1 GB, or 5/8 of all RAM, whichever is more."
Here is the actual code defining these default in
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c:
/* set min cache to 1/32 of all memory, or arc_abs_min, whichever is
more */
arc_c_min = MAX(allmem / 32, arc_abs_min);
/* set max to 5/8 of all memory, or all but 1GB, whichever is more */
if (allmem >= 1 << 30)
arc_c_max = allmem - (1 << 30);
else
arc_c_max = arc_c_min;
arc_c_max = MAX(allmem * 5 / 8, arc_c_max);
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