From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Subject: Re: USB Scanner Date: Mon, 03 Jan 2011 17:21:05 -0700 Message-ID: <4D2267F1.3070808@gmail.com> References: <4D21EE8A.7060108@rdsoftware.de> <4D2254C7.40906@gmail.com> <4D225D30.6030907@rdsoftware.de> <4D2260C9.60405@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Cc: Erik Rull , kvm@vger.kernel.org To: David Ahern Return-path: Received: from mail-gx0-f174.google.com ([209.85.161.174]:35177 "EHLO mail-gx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750803Ab1ADAVJ (ORCPT ); Mon, 3 Jan 2011 19:21:09 -0500 Received: by gxk9 with SMTP id 9so2772826gxk.19 for ; Mon, 03 Jan 2011 16:21:09 -0800 (PST) In-Reply-To: <4D2260C9.60405@gmail.com> Sender: kvm-owner@vger.kernel.org List-ID: On 01/03/11 16:50, David Ahern wrote: >> thanks for the patch. >> Have you tested USB transfer rates using a USB Memory Stick or something >> similar? If yes, which transfer rates have you reached? hmm.... more specifically, 8-11 Mbps depending on type of USB storage device. Harddrives work better than flash. As an example, on my Dell laptop with a T9550@2.66GHz the command: time dd if=/dev/zero of=/tmp/junk oflag=dsync bs=1M count=256 shows the following rates: Kingston, 8GB stick (enterprise quality versus consumer grade): 9.7 MB/sec Seagate external drive (older, low end consumer model): 11.6 MB/sec David