From owner-freebsd-current@FreeBSD.ORG Fri Apr 22 16:55:40 2005 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 0AF7716A4CF for ; Fri, 22 Apr 2005 16:55:40 +0000 (GMT) Received: from pne-smtpout2-sn1.fre.skanova.net (pne-smtpout2-sn1.fre.skanova.net [81.228.11.159]) by mx1.FreeBSD.org (Postfix) with ESMTP id A329143D5E for ; Fri, 22 Apr 2005 16:55:39 +0000 (GMT) (envelope-from daniel_k_eriksson@telia.com) Received: from sentinel (195.198.193.104) by pne-smtpout2-sn1.fre.skanova.net (7.1.026.7) id 42687F20000328E3; Fri, 22 Apr 2005 18:55:38 +0200 From: "Daniel Eriksson" To: "'FreeBSD Current'" Date: Fri, 22 Apr 2005 18:55:34 +0200 Organization: Home Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook, Build 11.0.6353 In-Reply-To: <426925C7.3030004@samsco.org> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 Thread-Index: AcVHWI0baIiRdLYrR1ysbx0LE2ySYgAAr6cQ Subject: RE: Serious I/O problems (bad performance and live-lock) 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: Fri, 22 Apr 2005 16:55:40 -0000 Scott Long wrote: > Ok, next test would be to turn off mpsafevm. This is just a simple > guess, though, but and changes in the behaviour would be very > interesting to note. With debug.mpsafevfs="0" and debug.mpsafevm="0" it doesn't seem like I can force the machine into live-lock. No matter how long I let 'dd' run I can still abort it with CTRL-C easily. However, after a few minutes the machine becomes mostly useless because it takes 30-60 seconds to execute simple commands such as ps or ls. According to 'top', the dd process spend most of its time in "wdrain" state. /Daniel Eriksson