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Date:	Fri, 23 Mar 2018 15:40:28 -0700
From:	L A Walsh <cygwin AT tlinx DOT org>
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To:	cygwin AT cygwin DOT com
Subject:	Re: SSH/SFTP Network Performance?
References:	<a45d39ab-93e1-41d5-22c7-40a61e355fd5 AT gmail DOT com>
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Jordan Geoghegan wrote:
> 
> Has anyone ever successfully transferred 150Mbps or more over the 
> network using scp/sftp/rsync etc on Cygwin?
----
My experience was to use the cifs protocol as easiest (over local
network).  With a 10Gb (limited to 8Gb due to running on older
PCIe interface) card, I'm getting:

/h> bin/iotest
Using bs=16.0M, count=64, iosize=1.0G
R:1073741824 bytes (1.0GB) copied, 1.67486 s, 611MB/s
W:1073741824 bytes (1.0GB) copied, 4.01592 s, 255MB/s

That's on a Win7 client to a linux-samba server.

If you want to get better results over SSH, you need to 
have a custom ssh that allows a null encryption for block
transfers.  See https://www.psc.edu/hpn-ssh.

Encryption really slows things down.

Also, on a local net, using Jumbo packets also helps
(I have a 9000 mtu on my local net).

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