Subject: Re: nfsd and process load sharing
To: Jason Thorpe <>
From: Simon Burge <>
List: tech-kern
Date: 06/06/1999 15:39:46
Jason Thorpe wrote:

> On Fri, 4 Jun 1999 10:00:08 +0200 
>  Frank van der Linden <> wrote:
>  > I could change the code to put free nfsds at the back of the queue so that
>  > nfsds are used round-robin if it makes you feel happy ;-)
> Actually, the current scheme is much better.  It allows you to see
> how many nfsds you *actually* need.
> I.e. Simon could probably prune it down to one or two and his system would
> still be just fine.

Since this machine's _only_ job is to NFS serve a ccd, I'll not worry
about it.  I chose 20 nfsd based on an old rule of thumb that said you
use (2 x num-disks) as the number of nfsd's.

While we're talking about performance, I remember a discussion about ccd
tuning from a a while back but can't find the reference any more.  This
is a 1.3.3/pmax with 10 2GB disks in a ccd and "options CCDNBUF=16" in
the config file.  Here's the output of "ccdconfig -s" (the machines been
up for ~100 days) - look ok?

	Statistics for ccd0:
		freelist count: 160
		freelist hiwater: 160
		freelist misses: 1657
		ccdbuf allocations: 10990878

Michael (if you're listening) - as Mr FAQ, is there a place this info
could live?