On Iau, 2004-06-03 at 22:26, Lucius, Leland wrote:
> Well, I can set the default TCP buffer size to different values for the z/OS
> stack and we have it set to 65535, so I'd say it's on the largish size.
> But, I don't know if the FTP server issues a setsockopt() to set a different
> value or not. And, I don't much feel upto an API trace to find out. ;-)
Do a short transfer and tcpdump it. Look at the window size offered by
the server in the "syn" frame, that is a good guide to the buffering.
The actual buffering size needed is basically
bandwidth * rtt (round-trip-time)
obviously zOs the roundtrip time is a bit weird - its a property of the
scheduling of the virtual machines not the network distance and I've no
idea how IBM drive this.
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