From owner-freebsd-net Mon Feb 25 0:56: 1 2002 Delivered-To: freebsd-net@freebsd.org Received: from iguana.icir.org (iguana.icir.org [192.150.187.36]) by hub.freebsd.org (Postfix) with ESMTP id E560A37B405 for ; Mon, 25 Feb 2002 00:55:59 -0800 (PST) Received: (from rizzo@localhost) by iguana.icir.org (8.11.6/8.11.3) id g1P8tmV90013; Mon, 25 Feb 2002 00:55:48 -0800 (PST) (envelope-from rizzo) Date: Mon, 25 Feb 2002 00:55:48 -0800 From: Luigi Rizzo To: Richard A Steenbergen Cc: freebsd-net@FreeBSD.ORG Subject: Re: HZ=1000 and NFS Message-ID: <20020225005547.A89674@iguana.icir.org> References: <20020224095015.GJ413@overlord.e-gerbil.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20020224095015.GJ413@overlord.e-gerbil.net> User-Agent: Mutt/1.3.23i Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org 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 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) > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message