Re: Network Performance?
- Date: Mon, 9 Apr 2018 11:30:17 -0700
- From: Jordan Geoghegan <jgeoghegan60@xxxxxxxxx>
- Subject: Re: Network Performance?
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=sshtime scp default-nlaw.tar.7z ishtar:/tmpdefault-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 -aCYGWIN_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. -- 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
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