From owner-freebsd-usb@FreeBSD.ORG Fri Mar 19 10:30:04 2010 Return-Path: Delivered-To: freebsd-usb@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 390F21065670 for ; Fri, 19 Mar 2010 10:30:04 +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 95BFF8FC20 for ; Fri, 19 Mar 2010 10:30:02 +0000 (UTC) Received: from mail.cicely.de ([10.1.1.37]) by raven.bwct.de (8.13.4/8.13.4) with ESMTP id o2JATxt1012494 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 19 Mar 2010 11:30:00 +0100 (CET) (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 o2JATswG008766 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 19 Mar 2010 11:29:54 +0100 (CET) (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 o2JATsmf090163; Fri, 19 Mar 2010 11:29:54 +0100 (CET) (envelope-from ticso@cicely7.cicely.de) Received: (from ticso@localhost) by cicely7.cicely.de (8.14.2/8.14.2/Submit) id o2JATreM090162; Fri, 19 Mar 2010 11:29:53 +0100 (CET) (envelope-from ticso) Date: Fri, 19 Mar 2010 11:29:53 +0100 From: Bernd Walter To: Sebastian Huber Message-ID: <20100319102953.GO83844@cicely7.cicely.de> References: <4B9FA7CB.70200@embedded-brains.de> <20100316180109.GE70566@cicely7.cicely.de> <4BA344C3.2010901@embedded-brains.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4BA344C3.2010901@embedded-brains.de> 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: Bernd Walter , ticso@cicely.de, freebsd-usb@freebsd.org Subject: Re: How fast is the OHCI driver? X-BeenThere: freebsd-usb@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: ticso@cicely.de List-Id: FreeBSD support for USB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Mar 2010 10:30:04 -0000 On Fri, Mar 19, 2010 at 10:32:51AM +0100, Sebastian Huber wrote: > On 03/16/2010 07:01 PM, Bernd Walter wrote: > > On Tue, Mar 16, 2010 at 04:46:19PM +0100, Sebastian Huber wrote: > [...] > >> Has someone values from other FreeBSD based systems with an OHCI controller? > > > > I can easily get more with AT91RM9200 (also ARM9 with OHCI). > > A short test: > > [73]chipmunk.cicely.de# dd if=/dev/da0 bs=128k of=/dev/null count=100 > > 100+0 records in > > 100+0 records out > > 13107200 bytes transferred in 16.762732 secs (781925 bytes/sec) > > > > Speedwise the system is on the lowest end of ARM9 systems we support. > > > > Thank you for your reference values. Actually my test setup on the FreeBSD > based system was bad. I now have the following values: > > TSZ: Size of one transfer block in bytes > TIME: Time to transfer 1024 blocks in seconds > RATE: Bytes transfered per second > > TSZ TIME RATE > 512 6.15 85250 > 1024 7.17 146244 > 2048 8.20 255750 > 4096 10.24 409600 > 8192 13.38 626951 > 16384 21.50 780335 > 32768 36.92 908841 > 65536 67.92 988057 > 131072 131.39 1021521 > 262144 259.00 1036430 > 524288 514.16 1044170 > 1048576 964.04 1048532 > > So it looks very good if you use the right transfer size. That's normal - Linux uses block devices, which prereads bigger blocks, while we have character devices and have physical control. The story isn't a problem if you use a filesystem, because it does bigger reads. The consumer code likely knows better what is worth to be preread and/or cached. -- B.Walter http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.