From owner-freebsd-current@FreeBSD.ORG Mon Jan 12 14:13:18 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 04DFE16A4CE; Mon, 12 Jan 2004 14:13:18 -0800 (PST) Received: from carver.gumbysoft.com (carver.gumbysoft.com [66.220.23.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1208C43D41; Mon, 12 Jan 2004 14:13:17 -0800 (PST) (envelope-from dwhite@gumbysoft.com) Received: by carver.gumbysoft.com (Postfix, from userid 1000) id E217B72DC7; Mon, 12 Jan 2004 14:13:16 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by carver.gumbysoft.com (Postfix) with ESMTP id DC8CA72DB5; Mon, 12 Jan 2004 14:13:16 -0800 (PST) Date: Mon, 12 Jan 2004 14:13:16 -0800 (PST) From: Doug White To: Don Lewis In-Reply-To: <200401122112.i0CLC87E034120@gw.catspoiler.org> Message-ID: <20040112141254.V54897@carver.gumbysoft.com> References: <200401122112.i0CLC87E034120@gw.catspoiler.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: mi@aldan.algebra.com cc: current@FreeBSD.org Subject: Re: core-dumping over NFS X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Jan 2004 22:13:18 -0000 On Mon, 12 Jan 2004, Don Lewis wrote: > On 12 Jan, Mikhail Teterin wrote: > > > . 5.2-CURRENT (Dec 14) server, RedHat-9 client: > > core is created properly, but sometimes the server goes > > into a frenzy with the sys-component (bufdaemon) taking > > up the entire 100% of the CPU-time (P4 at 2GHz); it only > > writes @4Mb/s (~14% of the disk's bandwidth) and the > > only cure is to restart the /etc/rc.d/nfsd; trying to, > > for example, switch from X11 to a textual console, when > > this is happening reliably hangs the machine. > > I saw something similar a in the last month when running iozone on a > FreeBSD client with an nfs file system mounted from a FreeBSD server. I > think this was in the 5.2-BETA timeframe. The client typically ran out > of CPU first, but the server was not far behind. This happened in the > tests with the larger file and/or block sizes. Bufdaemon was typically > the big consumer of CPU. Hm, I can attempt to reproduce this on 5.2-rel or -current. Can you provide the options used to iozone? -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org