From owner-freebsd-questions@FreeBSD.ORG Tue Feb 9 23:16:03 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7B72E106568B for ; Tue, 9 Feb 2010 23:16:03 +0000 (UTC) (envelope-from mexas@bristol.ac.uk) Received: from dirj.bris.ac.uk (dirj.bris.ac.uk [137.222.10.78]) by mx1.freebsd.org (Postfix) with ESMTP id 39C318FC15 for ; Tue, 9 Feb 2010 23:16:03 +0000 (UTC) Received: from ncsd.bris.ac.uk ([137.222.10.59] helo=ncs.bris.ac.uk) by dirj.bris.ac.uk with esmtp (Exim 4.69) (envelope-from ) id 1NezJK-00003k-6o for freebsd-questions@freebsd.org; Tue, 09 Feb 2010 23:16:02 +0000 Received: from mech-cluster241.men.bris.ac.uk ([137.222.187.241]) by ncs.bris.ac.uk with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.67) (envelope-from ) id 1NezJK-0005mE-4J for freebsd-questions@freebsd.org; Tue, 09 Feb 2010 23:16:02 +0000 Received: from mech-cluster241.men.bris.ac.uk (localhost [127.0.0.1]) by mech-cluster241.men.bris.ac.uk (8.14.3/8.14.3) with ESMTP id o19NG1JU043362 for ; Tue, 9 Feb 2010 23:16:01 GMT (envelope-from mexas@bristol.ac.uk) Received: (from mexas@localhost) by mech-cluster241.men.bris.ac.uk (8.14.3/8.14.3/Submit) id o19NG1Zc043361 for freebsd-questions@freebsd.org; Tue, 9 Feb 2010 23:16:01 GMT (envelope-from mexas@bristol.ac.uk) X-Authentication-Warning: mech-cluster241.men.bris.ac.uk: mexas set sender to mexas@bristol.ac.uk using -f Date: Tue, 9 Feb 2010 23:16:01 +0000 From: Anton Shterenlikht To: freebsd-questions@freebsd.org Message-ID: <20100209231601.GF41851@mech-cluster241.men.bris.ac.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.20 (2009-06-14) Subject: sftp from home wireless box to work - get is much faster that put X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 Feb 2010 23:16:03 -0000 I was trying to measure the file transfer rates between my home and my office boxes. Both are 9.0-current. At home I've wireless, TL-WN851N, using ath(4) driver. I used sftp(1), which I launch from the home box. I made files sized 10MB, 100MB and 1GB via dd if=/dev/zero of=/home/mexas/1gb bs=1m count=10 dd if=/dev/zero of=/home/mexas/1gb bs=1m count=100 dd if=/dev/zero of=/home/mexas/1gb bs=1m count=1024 respectively. What I discovered is put(mput) is much slower than get(mget). Here is a sample of timings: 10MB file ######### sftp> put 1gb Uploading 1gb to /usr/home/mexas/1gb 1gb 100% 10MB 59.2KB/s 02:53 sftp> mget 1gb Fetching /usr/home/mexas/1gb to 1gb /usr/home/mexas/1gb 100% 10MB 330.3KB/s 00:31 100MB file ########## sftp> mput 1gb Uploading 1gb to /usr/home/mexas/1gb 1gb 100% 100MB 58.6KB/s 29:07 sftp> mget 1gb Fetching /usr/home/mexas/1gb to 1gb /usr/home/mexas/1gb 100% 100MB 1.0MB/s 01:41 sftp> mget 1gb Fetching /usr/home/mexas/1gb to 1gb /usr/home/mexas/1gb 100% 100MB 930.9KB/s 01:50 1GB file ######## sftp> mget 1gb Fetching /usr/home/mexas/1gb to 1gb /usr/home/mexas/1gb 100% 1024MB 796.8KB/s 21:56 sftp> mput 1gb Uploading 1gb to /usr/home/mexas/1gb 1gb 7% 79MB 56.3KB/s 4:46:28 ETA (I interrupted the last transfer, just too long to wait). So putting (sending) a file is about 5-17 times faster than getting (receiving) it. What is the reason behind this? many thanks anton -- Anton Shterenlikht Room 2.6, Queen's Building Mech Eng Dept Bristol University University Walk, Bristol BS8 1TR, UK Tel: +44 (0)117 331 5944 Fax: +44 (0)117 929 4423