From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 11999 invoked by alias); 24 Mar 2018 02:06:38 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 10655 invoked by uid 89); 24 Mar 2018 02:06:36 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=0.6 required=5.0 tests=AWL,BAYES_50,SPF_PASS,T_RP_MATCHES_RCVD autolearn=ham version=3.3.2 spammy=drivers, purchased, surface, rates X-HELO: mailsrv.cs.umass.edu Received: from mailsrv.cs.umass.edu (HELO mailsrv.cs.umass.edu) (128.119.240.136) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Sat, 24 Mar 2018 02:06:34 +0000 Received: from [192.168.0.5] (c-24-62-203-86.hsd1.ma.comcast.net [24.62.203.86]) by mailsrv.cs.umass.edu (Postfix) with ESMTPSA id D2D21401CBD2; Fri, 23 Mar 2018 22:06:32 -0400 (EDT) Reply-To: moss@cs.umass.edu Subject: Re: SSH/SFTP Network Performance? To: Jordan Geoghegan Cc: cygwin@cygwin.com References: From: Eliot Moss Message-ID: <115ae2df-da57-12ce-5c2c-2e77da50b548@cs.umass.edu> Date: Sat, 24 Mar 2018 05:07:00 -0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2018-03/txt/msg00392.txt.bz2 On 3/23/2018 9:54 PM, Jordan Geoghegan wrote: > Hi Elliot, It's Eliot, but no matter ... > What was your setup that allowed you to reach 500Mbit? How were you copying the files? Were you > using SFTP, SCP or rsync? I think I said rsync. It was over ssh. I disable compression since I use this to send large files that are already compressed. > Was it a Cygwin to Cygwin transfer, or was there another OS involved? Sender: Surface Book Windows 10 (very up to date). Microsoft 1 Gb USB Ethernet adapter. Other end: RedHat kernel 3.10.0-693.17.1.el7.x86_64 on a recently purchased Xeon server made by Dell. As I think I mentioned before, I found that for wireless transfer (which this wasn't), to get better performance than recent drivers, I had to go to an somewhat old driver, and also disable 5G, using only the slower rate. Given that when I use wireless I am often at home and have only 12 Mbps uplink from Comcase, using the slower wireless is not a bandwidth problem. However, something about the drivers still limits me to about half the theoretical rate. I get a very regular square-wave sort of pattern when watching the transfer rate, with a period of almost exactly 10 secs. Again, that is only for wireless. Ethernet, except at the very highest rates, hits the max and generally stays there, e.g., 150 Mbps on the slower net from my office. Regards - Eliot -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple