From owner-freebsd-current@FreeBSD.ORG Fri Jul 29 19:40:33 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 941EF16A41F; Fri, 29 Jul 2005 19:40:33 +0000 (GMT) (envelope-from julian@elischer.org) Received: from postoffice.vicor-nb.com (postoffice.vicor.com [69.26.56.52]) by mx1.FreeBSD.org (Postfix) with ESMTP id 248CD43D45; Fri, 29 Jul 2005 19:40:33 +0000 (GMT) (envelope-from julian@elischer.org) Received: from localhost (localhost [127.0.0.1]) by postoffice.vicor-nb.com (Postfix) with ESMTP id 9D1BB4CE7C3; Fri, 29 Jul 2005 12:40:32 -0700 (PDT) Received: from postoffice.vicor-nb.com ([127.0.0.1]) by localhost (postoffice.vicor-nb.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 99801-03; Fri, 29 Jul 2005 12:40:32 -0700 (PDT) Received: from [208.206.78.97] (julian.vicor-nb.com [208.206.78.97]) by postoffice.vicor-nb.com (Postfix) with ESMTP id 16D934CE7C0; Fri, 29 Jul 2005 12:40:32 -0700 (PDT) Message-ID: <42EA862F.70205@elischer.org> Date: Fri, 29 Jul 2005 12:40:31 -0700 From: Julian Elischer User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.8) Gecko/20050629 X-Accept-Language: en, hu MIME-Version: 1.0 To: Marc Olzheim References: <42E88135.30603@elischer.org> <42E88F2B.5000108@elischer.org> <20050728082844.GW46538@darkness.comp.waw.pl> <42E898A6.6010803@elischer.org> <20050728115251.GA20091@beatrix.daedalusnetworks.priv> <20050728135613.GD46538@darkness.comp.waw.pl> <42E93EE1.2090009@elischer.org> <42E94310.20806@samsco.org> <42E94A88.4010603@elischer.org> <20050729144452.GA95803@stack.nl> In-Reply-To: <20050729144452.GA95803@stack.nl> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at postoffice.vicor.com Cc: re@freebsd.org, FreeBSD Current , Pawel Jakub Dawidek , Giorgos Keramidas Subject: Re: 6.0 VFS/VM over-runs. Was: Apparent strange disk behaviour in 6.0 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: Fri, 29 Jul 2005 19:40:33 -0000 Marc Olzheim wrote: >On Thu, Jul 28, 2005 at 02:13:44PM -0700, Julian Elischer wrote: > > >>mount a large partition that has some room.. hopefully several times >>the space of all RAM. >>. >> >>do: >> >>dd if=/dev/zero of=/${mountpoint}/bigfile bs=128k count=1000000 & iostat 1 >> >> >>notice that dd dies with "not enough swapspace" after some number of >>seconds. >>(there is no swap attached). also notice that until the crash, IO speed >>was max for the >>disk. >> >>then add swap and do it again. >> >>notice that at teh point where dd previously crashed, the swap disk >>springs into life and disk IO on your main disk goes into the toilet. >>notice that dd gets swapped out. (!!!!) >> >>when the disk recovers enough, dd pages back in and creates more IO but >>in teh mean time there is no IO >>going on to the disk.. (watch the LEDs). >> >> > >Just to be clear, this happens on 5-STABLE, 6-STABLE and 7-CURRENT. > > it doesn't appear to hit 5.4. at least not for my small ATA based workstation. >Marc > >