From owner-freebsd-performance@FreeBSD.ORG Tue Jun 21 13:08:21 2005 Return-Path: X-Original-To: freebsd-performance@freebsd.org Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6BFAF16A41C for ; Tue, 21 Jun 2005 13:08:21 +0000 (GMT) (envelope-from killing@multiplay.co.uk) Received: from multiplay.co.uk (www1.multiplay.co.uk [212.42.16.7]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0AAA743D1F for ; Tue, 21 Jun 2005 13:08:20 +0000 (GMT) (envelope-from killing@multiplay.co.uk) Received: from vader ([212.135.219.179]) by multiplay.co.uk (multiplay.co.uk [212.42.16.7]) (MDaemon.PRO.v8.0.2.R) with ESMTP id md50001543885.msg for ; Tue, 21 Jun 2005 14:02:22 +0100 Message-ID: <00fe01c57662$2ac82700$b3db87d4@multiplay.co.uk> From: "Steven Hartland" To: , References: <20050621025727.GI24844@philemon.async.caltech.edu> Date: Tue, 21 Jun 2005 14:07:20 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2527 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 X-Spam-Processed: multiplay.co.uk, Tue, 21 Jun 2005 14:02:22 +0100 (not processed: message from valid local sender) X-MDRemoteIP: 212.135.219.179 X-Return-Path: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-performance@freebsd.org X-MDAV-Processed: multiplay.co.uk, Tue, 21 Jun 2005 14:02:23 +0100 Cc: Subject: Re: sustained sequential disk IO runs interactivity into the ground X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Jun 2005 13:08:21 -0000 Have you tried the vfs patch posted a few weeks ago? Steve / K ----- Original Message ----- From: >I was doing a dd of dev/zero into a file on a UFS2 filesystem > (softupdates disabled) on a clean 5.4-R system. > > an exec of top took approximately 30 seconds to complete > and then revealed sys: 13% and idle: 87% > > quit, repeat five times, same delay, same numbers each time. > > FreeBSD 4.11 managed this with only a minor interactivity > hit. > > What's going on here? Any ideas? ================================================ 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 (023) 8024 3137 or return the E.mail to postmaster@multiplay.co.uk.