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diff --git a/share/man/man5/tarfs.5 b/share/man/man5/tarfs.5
--- a/share/man/man5/tarfs.5
+++ b/share/man/man5/tarfs.5
@@ -74,6 +74,15 @@
and
.Cm ztsd:frame-per-file
options.
+Sensible frame sizes are powers of 2 between the system's base page size
+(see
+.Xr arch 7 )
+and the value of the
+.Sy kern.maxphys
+sysctl.
+Smaller frames will generally yield a worse compression ratio and require extra
+kernel memory to maintain an index, and larger frames will on average require
+more CPU time to access data when performing random I/O.
.Sh DIAGNOSTICS
If enabled by the
.Dv TARFS_DEBUG

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