Poor network performance with cygwin utilities

jason@ancept.com jason@ancept.com
Wed Sep 24 22:21:00 GMT 2003

Ive searched the lists, but havent come up with anything useful, so I ask:

Are there known performance problems with cygwins networking layer? I ask this b
ecause I seem to be capped at around 160k/sec uploading from my PC with cygwin.
The destination machine is AIX, connected by 100mbit switch. Same network. I get
 approximately the same upload speed with SCP and ncftpput:

jason@bobafett ~/head/mp
$ ncftpput -u xxxxx -p xxxxx deathstar \~ build/ams.war
build/ams.war: 21.75 MB 162.22 kB/s
jason@bobafett ~/head/mp

$ scp build/ams.war jason@deathstar:
ams.war 100% 22MB 155.2KB/s 02:21
Neither machine showed significant CPU load during either test. (both machines <

However, using M$s FTP client I get over 11MB/sec:

ftp> put ams.war
200 PORT command successful.
150 Opening data connection for ams.war.
226 Transfer complete.
ftp: 22810702 bytes sent in 1.95Seconds 11679.83Kbytes/sec.

Has anyone seen similar problems?

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