From owner-freebsd-stable@FreeBSD.ORG Tue Sep 23 09:19:23 2003 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1112A16A4B3 for ; Tue, 23 Sep 2003 09:19:23 -0700 (PDT) Received: from carver.gumbysoft.com (carver.gumbysoft.com [66.220.23.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0D1024400D for ; Tue, 23 Sep 2003 09:19:19 -0700 (PDT) (envelope-from dwhite@gumbysoft.com) Received: by carver.gumbysoft.com (Postfix, from userid 1000) id EE5D272DA3; Tue, 23 Sep 2003 09:19:18 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by carver.gumbysoft.com (Postfix) with ESMTP id ECABD72DA2; Tue, 23 Sep 2003 09:19:18 -0700 (PDT) Date: Tue, 23 Sep 2003 09:19:18 -0700 (PDT) From: Doug White To: Brian Behlendorf In-Reply-To: <20030922120422.W8800@fez.hyperreal.org> Message-ID: <20030923091649.F86981@carver.gumbysoft.com> References: <20030922120422.W8800@fez.hyperreal.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: stable@freebsd.org Subject: Re: tuning parameters for parallel access to umass devices? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Sep 2003 16:19:23 -0000 On Mon, 22 Sep 2003, Brian Behlendorf wrote: > > It looks like copying files over USB to a umass device causes other I/O > attempts to be blocked for an unreasonable (10-20 seconds) amount of time. > Here's the device in question: On the volume being copied to, or another volume? > da2: 650KB/s transfers Don't forget that this isn't much faster than a floppy disk, and flash I/O is pretty slow anyway. -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org