My next question has to do with the TCP window size parameter in WinQVTNet.
If I understand it correctly, it is meant to allow transmission of multiple
packets with out acknowlegements (well enough packets to fill the TCP window).
Watching the modem activity on a PC running WinQVTNet 2.6 over SLIP8250 of a
ftp yields much different light activity than with a Mac running MAC slip
with an ftp.
The behavior of the PC is that a packet comes across (receive light on for
a second or so), goes out, followed by a short pause where the ack goes back
over the line, then it receives again. On the MAC, the receive light runs
pretty much continuously with the transmit flashing every second or so.
It appears that the packets coming into the machine keep coming, not waiting
for acknowlegement, and matches up the acks as they come in.
Does any of this agree with anyones sense of reality? Both the PC and MAC are
similarly equiped modem wise. We are dialing into a NetBlazer which supports
SLIP/CSLIP etc. The MAC is using CSLIP, but it does not seem that would
affect things that much. I am seeing OVER a factor of two difference in
ftp throughput between the PC and MAC.
My MTU is 1000, my MSS is 980 as suggested by Joe D.
Any help or insight is greatly appreciated…
–
Mike Dove Email: m…@MicroUnity.com
MicroUnity Systems Engineering, Inc. Phone: 408-734-8100 x313
255 Caspian Way, Sunnyvale, CA Fax: 408-734-8136
