tech-kern: re: Do some disk accesses miss the UVM?

Subject: re: Do some disk accesses miss the UVM?
To: David Laight <david@l8s.co.uk>
From: matthew green <mrg@eterna.com.au>
List: tech-kern
Date: 01/25/2002 11:08:00

have you increased the number of vnodes?  the default max vnode
calculation tends to limit UBC usage to a fairly small portion
of the total available RAM in my experience.

my machines have this patch:


Index: sys/param.h
===================================================================
RCS file: /cvsroot/syssrc/sys/sys/param.h,v
retrieving revision 1.135
diff -p -r1.135 param.h
*** sys/param.h	2001/12/18 22:34:38	1.135
--- sys/param.h	2002/01/25 00:05:58
***************
*** 132,138 ****
  #define	NTEXT	(80 + NPROC / 8)		/* actually the object cache */
  #endif
  #ifndef NVNODE
! #define	NVNODE	(NPROC + NTEXT + 100)
  #define	NVNODE_IMPLICIT
  #endif
  #endif /* _KERNEL */
--- 132,138 ----
  #define	NTEXT	(80 + NPROC / 8)		/* actually the object cache */
  #endif
  #ifndef NVNODE
! #define	NVNODE	((NPROC + NTEXT + 100) * 4)
  #define	NVNODE_IMPLICIT
  #endif
  #endif /* _KERNEL */