Network Performance?

L A Walsh cygwin@tlinx.org
Sun Apr 8 23:08:00 GMT 2018


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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