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/
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/
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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