scp vs ftp performance on SGI IRIX????????

[Jay Chen]

Hi,

Running OpenSSH 3.5p1 or 3.7.1p2 on two SGI orgin 300 systems of IRIX 
6.5.17 with
4 600MHz CPU and gigabits network.

Transfer a 1GB file with ftp took 28 seconds.
Transfer a 1GB file with scp took 148 seconds.

Use "snoop" to capture all network packets between these two systems. Ftp 
tansmitted
about 107840 packets, but scp transmitted about 763339 packets.

Is this normal? Why?

Also, did the same test on two IBM AIX 4.3.3 systems with 1 CPU and 10Mb 
network.

Transfer a 1GB file with ftp took 1080 seconds
Transfer a 1GB file with scp using blowfish took 1059 seconds.
Ftp tansmitted about 207070 packets, but scp only transmitted only about 
190290 packets.

What a difference! Why?

Thanks.

Jay Chen