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List:       freebsd-net
Subject:    Re: HZ=1000 and NFS
From:       Luigi Rizzo <rizzo () icir ! org>
Date:       2002-02-25 8:55:48
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There used to be, long ago, some problems with HZ=1000 which were
related to some diskless stuff -- now i forget the details but i
believe it was some timeout field or the like overflowing.
This was fixed years ago, though, and i believe the relevant
code was in /sys/nfs/bootp_subr.c and related ones.

I am running an NFS server with 4.5 and HZ=1000 (no device_polling though)
and it seems to work fine.

	cheers
	luigi

On Sun, Feb 24, 2002 at 04:50:15AM -0500, Richard A Steenbergen wrote:
> Is anyone aware of problems with HZ=1000 and NFS?
> 
> I was playing around with Luigi's device polling and had no problems (and
> significant performance improvement under heavy network load), except for 
> one server doing NFS. After playing around with it for a bit I found that 
> it worked perfectly if I did not set HZ=1000. I had a problem with HZ=1000 
> and NFS once before when playing with ALTQ, but never persued it.
> 
> The problem I'm experiencing now is a complete system lockup, no panic or
> crashing or informative errors of any kind. The cursor still blinks but 
> everything else is totally frozen.
> 
> -- 
> Richard A Steenbergen <ras@e-gerbil.net>       http://www.e-gerbil.net/ras
> PGP Key ID: 0x138EA177  (67 29 D7 BC E8 18 3E DA  B2 46 B3 D8 14 36 FE B6)
> 
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