freebsd stable - Mar 2004 - Diskless machine - getdevs: error getting device stats

Howdy!

	I have some diskless machines that boot using PXE and mount
data over NFS. They are truly diskless. When I run
vmstat (or similarly systat -vm) I get

	vmstat: getdevs: error getting device stats
	getdevs: Invalid argument

	Other  PXE booted machines that mount hard drives don't
exhibit this behavior. 

	On machines that don't mount hard drives 
the sysctl variable 

	kern.devstat.numdevs  = 0


	A ktrace on vmstat shows that a call to sysctl fails.

	What is to be done to be able to run vmstat and systat -vm?

	Or what are the consequences of this. if any?

	Freebsd-9-STABLE.

	thanx - steve

On Wed, 31 Mar 2004, Steve Shorter wrote:
> Howdy!
>
> 	I have some diskless machines that boot using PXE and mount
> data over NFS. They are truly diskless. When I run
> vmstat (or similarly systat -vm) I get
>
> 	vmstat: getdevs: error getting device stats
> 	getdevs: Invalid argument
I'm going to guess that your world and kernel are out of sync.  Make sure
you've built the userland tools and the kernel were built from the same
code base.


-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite@gumbysoft.com          |  www.FreeBSD.org