From owner-freebsd-current@FreeBSD.ORG Thu Jun 3 10:10:35 2010 Return-Path: Delivered-To: current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 84A24106564A for ; Thu, 3 Jun 2010 10:10:35 +0000 (UTC) (envelope-from ticso@cicely7.cicely.de) Received: from raven.bwct.de (raven.bwct.de [85.159.14.73]) by mx1.freebsd.org (Postfix) with ESMTP id 079858FC17 for ; Thu, 3 Jun 2010 10:10:34 +0000 (UTC) Received: from mail.cicely.de ([10.1.1.37]) by raven.bwct.de (8.13.4/8.13.4) with ESMTP id o53AAUAv061214 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 3 Jun 2010 12:10:31 +0200 (CEST) (envelope-from ticso@cicely7.cicely.de) Received: from cicely7.cicely.de (cicely7.cicely.de [10.1.1.9]) by mail.cicely.de (8.14.3/8.14.3) with ESMTP id o53AASN0088583 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 3 Jun 2010 12:10:28 +0200 (CEST) (envelope-from ticso@cicely7.cicely.de) Received: from cicely7.cicely.de (localhost [127.0.0.1]) by cicely7.cicely.de (8.14.2/8.14.2) with ESMTP id o53AASHX032841; Thu, 3 Jun 2010 12:10:28 +0200 (CEST) (envelope-from ticso@cicely7.cicely.de) Received: (from ticso@localhost) by cicely7.cicely.de (8.14.2/8.14.2/Submit) id o53AARAE032840; Thu, 3 Jun 2010 12:10:27 +0200 (CEST) (envelope-from ticso) Date: Thu, 3 Jun 2010 12:10:27 +0200 From: Bernd Walter To: Hans Petter Selasky Message-ID: <20100603101027.GD27037@cicely7.cicely.de> References: <201006021750.17588.hselasky@c2i.net> <201006021825.25337.hselasky@c2i.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <201006021825.25337.hselasky@c2i.net> X-Operating-System: FreeBSD cicely7.cicely.de 7.0-STABLE i386 User-Agent: Mutt/1.5.11 X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED=-1, BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01 autolearn=ham version=3.3.0 X-Spam-Checker-Version: SpamAssassin 3.3.0 (2010-01-18) on spamd.cicely.de Cc: Marcelo/Porks , Garrett Cooper , current@freebsd.org Subject: Re: Fwd: umodem (4) recognize a CDC-ACM device X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: ticso@cicely.de List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Jun 2010 10:10:35 -0000 On Wed, Jun 02, 2010 at 06:25:25PM +0200, Hans Petter Selasky wrote: > > > Hi, > > > > > > Can you dump the USB descriptors of your device? > > > > Hi, right now I can do this at "FreeBSD 8.0-RELEASE-p2 #8 r206060M", > > but If you prefer tonight I can dump from 'freebsd-current' box. > > > > Thank you > > Hi, > > The problem is that LOW speed does not support BULK transfers according to the > USB specification. I guess we could switch that support on, though I'd rather > stick with the spec. I think the original sense is a bit outdated. It was when people had a single full speed controller on their systems and low speed transfers could easily drop overall performance, so it made sense to prohibid bulk transfers on low speed. Today however people have multiple channels and high speed chains where performance is only a matter up to the next transaction translator and even if they don't use a high speed hub it only harms performance on a single (of many) usb low/full channels, while bandwidth hungry devices usually are connected to other controllers. On the other hand - I never understood why people want to implement low speed devices. It has some many restrictions and isn't realy cheaper to build than full speed devices. -- B.Walter http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.