From owner-freebsd-current@FreeBSD.ORG Mon Aug 29 18:15:48 2005 Return-Path: X-Original-To: freebsd-current@FreeBSD.org 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 8136B16A41F for ; Mon, 29 Aug 2005 18:15:48 +0000 (GMT) (envelope-from truckman@FreeBSD.org) Received: from gw.catspoiler.org (217-ip-163.nccn.net [209.79.217.163]) by mx1.FreeBSD.org (Postfix) with ESMTP id 29ECE43D48 for ; Mon, 29 Aug 2005 18:15:45 +0000 (GMT) (envelope-from truckman@FreeBSD.org) Received: from FreeBSD.org (mousie.catspoiler.org [192.168.101.2]) by gw.catspoiler.org (8.13.3/8.13.3) with ESMTP id j7TIFXw1013092; Mon, 29 Aug 2005 11:15:37 -0700 (PDT) (envelope-from truckman@FreeBSD.org) Message-Id: <200508291815.j7TIFXw1013092@gw.catspoiler.org> Date: Mon, 29 Aug 2005 11:15:33 -0700 (PDT) From: Don Lewis To: kabaev@gmail.com, doconnor@gsoft.com.au In-Reply-To: <20050825202033.579b3e9c@kan.dnsalias.net> MIME-Version: 1.0 Content-Type: TEXT/plain; charset=us-ascii Cc: freebsd-current@FreeBSD.org Subject: Re: Odd performance problem (hitching) X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 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, 29 Aug 2005 18:15:48 -0000 On 25 Aug, Alexander Kabaev wrote: > On Fri, 26 Aug 2005 09:13:53 +0930 > "Daniel O'Connor" wrote: > >> I updated to -current recently (from an earlier -current) and haven't >> changed any kernel options, but now the systems seems to 'hitch' >> fairly frequently. ie the system will run fine then stall for half a >> second or so, then continue as normal. It is most noticeable when >> playing music. >> >> If I turn powerd off and run the CPU at full speed it works better, >> but it still happens on occasion so I am guessing powerd isn't the >> problem per se, but just makes it worse. >> >> I am not 100% sure when the problem started but if I get time I will >> try a binary search to find out.. It believe around 6.0-BETA1 (30 >> July) was OK, but I don't have any more data points yet. >> >> I've attached my dmesg and kernel config file if it helps. >> >> -- >> Daniel O'Connor software and network engineer >> for Genesis Software - http://www.gsoft.com.au >> "The nice thing about standards is that there >> are so many of them to choose from." >> -- Andrew Tanenbaum >> GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C > > > Can you try backing out this commit? > > http://cvsweb.FreeBSD.org/src/sys/kern/vfs_subr.c.diff?r1=1.641&r2=1.642 Any more info on this problem? I just got my MFC reminder for this change and I don't want to request permission for the MFC until I know for sure that it (or 1.636, which is also has a pending MFC) isn't the cause of the problem. What else is happening on machine when the symptoms occur? I would only expect vfs_subr.c 1.636 and 1.642 to affect the behaviour if there was a lot of file system activity that put pressure on the system to free up vnodes.