X-Recipient: archive-cygwin AT delorie DOT com DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:reply-to:subject:to:cc:references:from :message-id:date:mime-version:in-reply-to:content-type :content-transfer-encoding; q=dns; s=default; b=xxNAwcuUfRibpZ8F 9hnRfuaXwHUX3nVx5NQ0cvp5JPQ83YWo7e3+07KJ+slcAYbAWi6flAVSWSlNf8gE DMu5vwLbOZbtje9ytlMiN7zaGnKjeEpEu1bapdavqBjIR7yn67NATfLxQV5JwYzN 5PuHyn0of2VRoARhKTqxOi+0ZyQ= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:reply-to:subject:to:cc:references:from :message-id:date:mime-version:in-reply-to:content-type :content-transfer-encoding; s=default; bh=hh/FTwEI6TWI5jWZX75S+/ pZ6U0=; b=ktmwpMIVnbHxyLZ4u0taE6RbOaxZa+hD4v+6EC/ePJ0PNYA7bbQwYV 1/6A94FcQ1pKhvSzZtVrjQls5vWOyzc8zCQYqVDnjfni1HVtIF+RoovEXESKtnVS Ar1oo0/+nDx9ApP8HT3Ia+Z3MUbEnjE75AgbVAN4v/tl5/JJbRC9E= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: <cygwin.cygwin.com> List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com> List-Archive: <http://sourceware.org/ml/cygwin/> List-Post: <mailto:cygwin AT cygwin DOT com> List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs> Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com 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 Reply-To: moss AT cs DOT umass DOT edu Subject: Re: SSH/SFTP Network Performance? To: Jordan Geoghegan <jgeoghegan60 AT gmail DOT com> Cc: cygwin AT cygwin DOT com References: <a45d39ab-93e1-41d5-22c7-40a61e355fd5 AT gmail DOT com> <d1353aaf-271a-ba2f-7de0-80ca15b18e01 AT cs DOT umass DOT edu> <d400c16f-ff95-68fd-335d-0bd8ee28e154 AT gmail DOT com> From: Eliot Moss <moss AT cs DOT umass DOT edu> Message-ID: <115ae2df-da57-12ce-5c2c-2e77da50b548@cs.umass.edu> Date: Fri, 23 Mar 2018 22:06:31 -0400 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: <d400c16f-ff95-68fd-335d-0bd8ee28e154@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes 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