Subject: Re: Do some disk accesses miss the UVM?
To: David Laight <>
From: Artur Grabowski <>
List: tech-kern
Date: 01/25/2002 03:13:58
"David Laight" <> writes:

> > 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.
> I whopped up the number of vnodes using sysctl - didn't seem to affect
> things.
> I would have thought that the UBC remembered which disk blocks memeory
> held - so would have been independant of vnodes, but maybe someone
> implemented something different.

The handle that is used for "remembering" which memory pages map what data
is also called "vnode".