From owner-freebsd-usb@FreeBSD.ORG Sat Feb 28 23:36:01 2009 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 6DCF11065670 for ; Sat, 28 Feb 2009 23:36:01 +0000 (UTC) (envelope-from hselasky@c2i.net) Received: from swip.net (mailfe04.swip.net [212.247.154.97]) by mx1.freebsd.org (Postfix) with ESMTP id 066058FC08 for ; Sat, 28 Feb 2009 23:36:00 +0000 (UTC) (envelope-from hselasky@c2i.net) X-Cloudmark-Score: 0.000000 [] X-Cloudmark-Analysis: v=1.0 c=1 a=Ma5krZdYoiIA:10 a=-DXRHlJb_54A:10 a=MXw7gxVQKqGXY79tIT8aFQ==:17 a=w0sMN5FdUZJCwABS6woA:9 a=XcmE8TydKZfNHkRIwiYA:7 a=LwkYBQZGU6BbwbuS15XKWWHasIIA:4 a=LY0hPdMaydYA:10 Received: from [62.113.132.61] (account mc467741@c2i.net HELO laptop) by mailfe04.swip.net (CommuniGate Pro SMTP 5.2.6) with ESMTPA id 1202789428; Sun, 01 Mar 2009 00:35:59 +0100 From: Hans Petter Selasky To: freebsd-usb@freebsd.org Date: Sun, 1 Mar 2009 00:38:29 +0100 User-Agent: KMail/1.9.7 References: <200903010045.44904.man@email.com.ua> In-Reply-To: <200903010045.44904.man@email.com.ua> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200903010038.29534.hselasky@c2i.net> Cc: Subject: Re: Low perfomance when read from usb flash drive X-BeenThere: freebsd-usb@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: FreeBSD support for USB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 28 Feb 2009 23:36:01 -0000 On Saturday 28 February 2009, Artyom Mirgorodsky wrote: > Read speed when copy from usb flash drive decreased from 20MB/s (old usb > stack) to 12MB/s. (on windows above 22Mb/s). > Hi please explain what kind of test you have done. It's most likely not related to USB, but rather the file system. Maybe you can run the following test on Windows and FreeBSD to compare: dd if=/dev/da0 of=/dev/null bs=65536 --HPS