From owner-freebsd-questions@FreeBSD.ORG Tue Nov 17 15:55:40 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 76DA2106568B for ; Tue, 17 Nov 2009 15:55:40 +0000 (UTC) (envelope-from djackson452@gmail.com) Received: from mail-yw0-f178.google.com (mail-yw0-f178.google.com [209.85.211.178]) by mx1.freebsd.org (Postfix) with ESMTP id 2B4338FC17 for ; Tue, 17 Nov 2009 15:55:39 +0000 (UTC) Received: by ywh8 with SMTP id 8so126764ywh.3 for ; Tue, 17 Nov 2009 07:55:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from :user-agent:mime-version:to:subject:references:in-reply-to :content-type:content-transfer-encoding; bh=o+9RczV1rBN99KCIgiRJjAoIdh9nvTDorAfGwtHD2yQ=; b=d6Lzi8CCrUCT5HSFf1EQm23ck3Tl3PvDaK5gyJxLCuDrrpWvSJ1TqzX7zrezV4gNds VPQLp7r/HcYEJr0q2E/6dWEV6YjW09VFiSdtpgKo8m6HzN4y8RTTRUiNHfKizcVN0Qdu zWEcWiS/VBq4FTtTz8iP1dPZ12q8/rTeP3gts= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; b=Cx7CeWUOTLvSngoJ0KLhNZ/KMTO+g6IjCXfurct5F2kJ1/g1JBxibFRh4hKP3Bd7sz psh3o/AMNvo9fVkITuhieRUEP6Q1ctT1eAyACUxIa/K1Cy7pi4AMQX5fxN7wUIMp8OB7 dodtRk2Ye2lE4S7xuycedyfqOOE6eLHRcVOuw= Received: by 10.101.153.16 with SMTP id f16mr1475842ano.110.1258473338511; Tue, 17 Nov 2009 07:55:38 -0800 (PST) Received: from ?192.168.1.103? (pool-96-254-203-152.tampfl.fios.verizon.net [96.254.203.152]) by mx.google.com with ESMTPS id 22sm2123376yxe.57.2009.11.17.07.55.36 (version=TLSv1/SSLv3 cipher=RC4-MD5); Tue, 17 Nov 2009 07:55:37 -0800 (PST) Message-ID: <4B02C64C.3020207@gmail.com> Date: Tue, 17 Nov 2009 10:50:36 -0500 From: David Jackson User-Agent: Thunderbird 2.0.0.22 (Windows/20090605) MIME-Version: 1.0 To: freebsd-questions@freebsd.org References: <4B02B0AE.3040801@gmail.com> In-Reply-To: <4B02B0AE.3040801@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: Lockup problems with USB disks X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2009 15:55:40 -0000 I apologise if this was posted more than once, for some reason the emails i sent were not reflected back to me, so i assumed they had not gone through , i checked the archive on the web page and they were there. For some reason some messages are not coming through on my gmail account. David Jackson wrote: > > I have a USB hard drive. Whenever I open two programs which utilise > the USB hard drive simultaneously, these programs, i assume when they > attempt to write to the hard drive lock up due to what i suspect must > be some issue with the USB driver and perhaps a deadlock involving > multiple concurrent accesses to the drive. When they attempt to access > the drive the programs can lock up for several minutes before being > unblocked. When only one program is using the drive this behaviour > does not seem to occur. > > It seems most likely that this is a USB level problem involving the > USB drivers. I am using FreeBSD 7.1. It is annoying behaviour to say > the least and I wonder what can be done about it, and if this issue is > being addressed, perhaps in the recent redesign of the USB code. It > seems to be a pretty consistent issue, happening with multiple > installs of FreeBSD and different drives. > > Thank you.