From owner-freebsd-stable@FreeBSD.ORG Wed May 13 18:22:47 2009 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 291B5106564A; Wed, 13 May 2009 18:22:47 +0000 (UTC) (envelope-from prvs=1384594dfb=killing@multiplay.co.uk) Received: from mail1.multiplay.co.uk (core6.multiplay.co.uk [85.236.96.23]) by mx1.freebsd.org (Postfix) with ESMTP id 7C0CF8FC0A; Wed, 13 May 2009 18:22:46 +0000 (UTC) (envelope-from prvs=1384594dfb=killing@multiplay.co.uk) DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=multiplay.co.uk; s=Multiplay; t=1242238313; x=1242843113; q=dns/txt; h=Received: Message-ID:From:To:Cc:References:Subject:Date:MIME-Version: Content-Type:Content-Transfer-Encoding; bh=Axnf3M+++RYd95MwtAj4H XNoXx54rzNQZ1jx8cSvhMM=; b=kUovAswIeEveP575Uz7qzx6Rwa0/Sgqqhe6pB ev15J9ev8u15EGxUIRgF5/cVJTXqVsoTsT8B304RLeuUO/gVGyllhOgVyQs3FGRc gU5IEfnYyVf2MS2zmNQrZJBPD2FmCZ2nM/zCw2aZUUJSGuJ08zqDd2BCeaO0Uhgk DGLzZY= X-MDAV-Processed: mail1.multiplay.co.uk, Wed, 13 May 2009 19:11:53 +0100 Received: from r2d2 by mail1.multiplay.co.uk (MDaemon PRO v10.0.4) with ESMTP id md50007508811.msg; Wed, 13 May 2009 19:11:53 +0100 X-Spam-Processed: mail1.multiplay.co.uk, Wed, 13 May 2009 19:11:53 +0100 (not processed: message from trusted or authenticated source) X-Authenticated-Sender: Killing@multiplay.co.uk X-MDRemoteIP: 85.236.106.102 X-Return-Path: prvs=1384594dfb=killing@multiplay.co.uk X-Envelope-From: killing@multiplay.co.uk Message-ID: <6670CCCC546E45E0A28628C45B37A074@multiplay.co.uk> From: "Steven Hartland" To: "Marc G. Fournier" , "John Baldwin" References: <20090513040719.D17646@hub.org><200905131009.00403.jhb@freebsd.org><20090513133143.M17646@hub.org> <200905131252.15171.jhb@freebsd.org> <20090513142806.V17646@hub.org> Date: Wed, 13 May 2009 19:12:01 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Cc: freebsd-stable@freebsd.org Subject: Re: More data on 7.2-RELEASE "hangs" X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 May 2009 18:22:47 -0000 ----- Original Message ----- From: "Marc G. Fournier" > Right now, IO is running ~775 processes ... at the time of the vmstat I > provided earlier, it was up to 1400 processes ... since there is only 5 > minutes between script runs, something is causing it to go from zero swap > -> high swap within a very short period of time, but since things get > badly locked up when it happens, I can't isolate where ... We've seen things similar to this when an process uncommon process does a query which locks the a table for a large amount of time on mysql. In our example this turned out to be an admin query in vbulletin. When it happened it turned a machine which was purring along quite nicely into a totally unresponsive machine in a matter of a few seconds as apache spawned more process that also then instantly stalled... So its likely the overloaded diagnosis could well be correct, but as you say it hard to diagnose with the machine in such an unusable state. Reducing max handlers etc on apache will help with this prevent the machine becoming unusable and hence give you time and resources to determine what the real issue is. Regards Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.