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Subject: Re: Network Performance?
To: L A Walsh <cygwin AT tlinx DOT org>
References: <a45d39ab-93e1-41d5-22c7-40a61e355fd5 AT gmail DOT com> <5AB5825C DOT 8060309 AT tlinx DOT org> <5AB6E770 DOT 8020603 AT tlinx DOT org> <8794ec10-dcee-4ad6-bfe6-3c8c108ca5f6 AT gmail DOT com> <5ACAA0E6 DOT 5040504 AT tlinx DOT org>
From: Jordan Geoghegan <jgeoghegan60 AT gmail DOT com>
Cc: cygwin AT cygwin DOT com
Message-ID: <04ef0912-46d6-3332-a3e2-0436e30d1452@gmail.com>
Date: Mon, 9 Apr 2018 11:30:17 -0700
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Note-from-DJ: This may be spam

Thanks for testing that for me! I had feared I was having filesytem 
speed issues as seen in WSL, but alas I was wrong. It turns out my issue 
with network performance bottnecks is due to the TCP window size not 
adjusting. Looking at the debug output of ssh, it seems the window size 
adjusts aren't being performed. Strangely enough, when I grabbed a fresh 
machine to test Cygwin on, I am able to get near wire speeds. Very strange.


On 04/08/18 16:08, L A Walsh wrote:
> Jordan Geoghegan wrote:
>> Thanks for the info. Would you be able to test file performance over 
>> the network? If you could just try copying a ~1GB file or what have 
>> you via sftp or rsync with actual writes to disk, I would be very 
>> interested to see how the numbers change.
> ---
>     Here is scp and rsync, using a tar, and a 1g file filled
> with zeros.   Note, my env RSYNC_RSH=ssh
>
>> time scp default-nlaw.tar.7z ishtar:/tmp 
> default-nlaw.tar.7z                           100%   62MB 83.1MB/s   
> 00:00    0.91sec 0.04usr 0.01sys (6.65% cpu)
>> ssh ishtar rm /tmp/default-nlaw.tar.7z
>> time rsync -v default-nlaw.tar.7z ishtar:/tmp/
> default-nlaw.tar.7z
> sent 64,588,267 bytes  received 35 bytes  43,058,868.00 bytes/sec
> total size is 64,572,413  speedup is 1.00
> 0.73sec 0.37usr 0.17sys (74.32% cpu)
> time scp /tmp/1g ishtar:/tmp/ 
> 1g                                            100% 1014MB 72.3MB/s   
> 00:14    15.00sec 0.04usr 0.07sys (0.81% cpu)
>> time rsync -v /tmp/1g ishtar:/tmp/
> 1g
> sent 1,063,515,721 bytes  received 35 bytes  125,119,500.71 bytes/sec
> total size is 1,063,256,064  speedup is 1.00
> 7.57sec 5.95usr 3.40sys (123.54% cpu)
>
>> uname -a
> CYGWIN_NT-6.1 Athenae 2.10.0(0.325/5/3) 2018-02-02 15:16 x86_64 Cygwin
>
>
> I generally don't use them to transfer files over a closed
> subnet as the performance is sub-optimal.
>
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