Module Name: src
Committed By: msaitoh
Date: Wed Oct 6 05:25:53 UTC 2021
Modified Files:
src/share/man/man4: options.4
Log Message:
Update the description of the NMBCLUSTERS. Add NMBCLUSTERS_MAX.
To generate a diff of this commit:
cvs rdiff -u -r1.519 -r1.520 src/share/man/man4/options.4
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/share/man/man4/options.4
diff -u src/share/man/man4/options.4:1.519 src/share/man/man4/options.4:1.520
--- src/share/man/man4/options.4:1.519 Thu Jun 3 20:18:06 2021
+++ src/share/man/man4/options.4 Wed Oct 6 05:25:53 2021
@@ -1,4 +1,4 @@
-.\" $NetBSD: options.4,v 1.519 2021/06/03 20:18:06 riastradh Exp $
+.\" $NetBSD: options.4,v 1.520 2021/10/06 05:25:53 msaitoh Exp $
.\"
.\" Copyright (c) 1996
.\" Perry E. Metzger. All rights reserved.
@@ -2076,15 +2076,20 @@ Mbuf clusters are MCLBYTES in size (usua
This is used to compute the size of the kernel VM map
.Em mb_map ,
which maps mbuf clusters.
-Default on most ports is 1024 (2048 with
-.Dq options GATEWAY
-).
+The default value is calculated from the amount of physical memory.
+Architectures without direct mapping also limit it based on the kmem_map size,
+which is used as backing store.
+Some archs limit the value with
+.Sq NMBCLUSTERS_MAX .
See
.Pa /usr/include/machine/param.h
-for exact default information.
+for those archs.
+This value can be accessed via the kern.mbuf.nmbclusters sysctl variable.
Increase this value if you get
.Dq mclpool limit reached
messages.
+.It Cd options NMBCLUSTERS_MAX=value
+The upper limit of NMBCLUSTERS.
.It Cd options NKMEMPAGES=value
.It Cd options NKMEMPAGES_MIN=value
.It Cd options NKMEMPAGES_MAX=value
