XP Pro to Irix 6.5.19f GigE card: Poor TCP performance

Here's our problem: TCP data from our Windows XP Pro boxes to our
Origin 2000 server always goes at 17MBytes/sec, even though they all
have GigE cards running at full speed, full duplex.

I'm using ttcp and pcattcp to test. I've tested all combinations to
and from our Windows, Linux and Irix boxen.For most combinations of
sending data back and forth, Windows<->Linux, Linux<->Irix, and even
Irix->Windows (though not Windows->Irix), the rates are ~50MBytes/sec.
Windows->Irix is always 17MBytes/sec.

The Origin 2000 has three optical GigE XIO cards, not trunked, and is
running 6.5.19f.

The correct card on the Origin always lights up during a test. We've
tried two of the three cards, and gotten the same result with both. It
doesn't seem to matter which brand of GigE card is in the XP box
(Intel, Broadcom, DLink), whether or not the XP drivers are updated, or
which XP box is used (various off-the-shelf and homebuilt machines).
The result is always 17MBytes/sec.

Any idea what might be going on here?

Any idea how to fix it?

Thanks.

Andrew Klaassen

.

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