svn commit: r213917 - head/share/man/man7
Konstantin Belousov
kib at FreeBSD.org
Sat Oct 16 09:46:03 UTC 2010
Author: kib
Date: Sat Oct 16 09:46:03 2010
New Revision: 213917
URL: http://svn.freebsd.org/changeset/base/213917
Log:
Document vfs.ncsizefactor and vfs.ncnegfactor.
MFC after: 2 weeks
Modified:
head/share/man/man7/tuning.7
Modified: head/share/man/man7/tuning.7
==============================================================================
--- head/share/man/man7/tuning.7 Sat Oct 16 09:44:31 2010 (r213916)
+++ head/share/man/man7/tuning.7 Sat Oct 16 09:46:03 2010 (r213917)
@@ -23,7 +23,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd August 11, 2010
+.Dd October 16, 2010
.Dt TUNING 7
.Os
.Sh NAME
@@ -534,6 +534,24 @@ It may be tuned down in specific cases w
read-ahead adversely affects performance or where system memory is really
low.
.Pp
+The
+.Va vfs.ncsizefactor
+sysctl defines how large VFS namecache may grow.
+The number of currently allocated entries in namecache is provided by
+.Va debug.numcache
+sysctl and the condition
+debug.numcache < kern.maxvnodes * vfs.ncsizefactor
+is adhered to.
+.Pp
+The
+.Va vfs.ncnegfactor
+sysctl defines how many negative entries VFS namecache is allowed to create.
+The number of currently allocated negative entries is provided by
+.Va debug.numneg
+sysctl and the condition
+vfs.ncnegfactor * debug.numneg < debug.numcache
+is adhered to.
+.Pp
There are various other buffer-cache and VM page cache related sysctls.
We do not recommend modifying these values.
As of
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