From owner-freebsd-usb@FreeBSD.ORG Sun Mar 1 00:02:07 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 5B8851065672 for ; Sun, 1 Mar 2009 00:02:07 +0000 (UTC) (envelope-from man@email.com.ua) Received: from mail.alkar.net (mail.alkar.net [195.248.191.95]) by mx1.freebsd.org (Postfix) with ESMTP id D36998FC08 for ; Sun, 1 Mar 2009 00:02:06 +0000 (UTC) (envelope-from man@email.com.ua) Received: from [92.113.36.235] (account man@email.com.ua HELO home.alkar.net) by mail.alkar.net (CommuniGate Pro SMTP 5.2.12) with ESMTPA id 1881318256; Sun, 01 Mar 2009 02:02:05 +0200 From: Artyom Mirgorodsky Organization: Vega To: Hans Petter Selasky Date: Sun, 1 Mar 2009 02:05:36 +0200 User-Agent: KMail/1.11.0 (FreeBSD/8.0-CURRENT; KDE/4.2.0; i386; svn-915845; 2009-01-20) References: <200903010045.44904.man@email.com.ua> <200903010038.29534.hselasky@c2i.net> In-Reply-To: <200903010038.29534.hselasky@c2i.net> MIME-Version: 1.0 Content-Type: text/plain; charset="koi8-r" Content-Transfer-Encoding: 8bit Content-Disposition: inline Message-Id: <200903010205.37192.man@email.com.ua> Cc: freebsd-usb@freebsd.org 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: Sun, 01 Mar 2009 00:02:07 -0000 >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 I'm test on FreeBSD7-stable and FreeBSD-current and post results. Flash drive, FS, computer the same. Windows only for example. PS dd makes the same result - problem not in the file system dd if=/dev/da0 of=/dev/null bs=65536 7281+0 records in 7281+0 records out 477167616 bytes transferred in 36.602952 secs (13036315 bytes/sec) systat -vm Disks ad4 ad6 da0 cd0 pass0 sg0 sg1 151844 wire KB/t 27.33 0.00 64.00 0.00 0.00 0.00 0.00 198628 act tps 9 0 200 0 0 0 0 758680 inact MB/s 0.25 0.00 12.50 0.00 0.00 0.00 0.00 1660 cache %busy 0 0 99 0 0 0 0 288948 free -- С уважением, Артём Миргородский tel: (056) 373 42 84 Jabber Id: artyom.mirgorodsky@gmail.com mailto: man@alkar.net