> I have recently seen a very noticable TCP performance drop transferring
> files (via FTP) from an SGI (both Indy & O2 running IRIX 6.x) to a machine
> running Linux 2.2.1. In the IRIX -> Linux direction the speed seems to be
> limited to a maximum of about 80Kb/s (over an ethernet) whereas in the
> other direction, the speed is what one would expect (given the hardware in
> the Linux machine). This situation does not occur between 2.0.x kernels
> and IRIX (with the same hardware on the Linux end), nor between a machine
> with 2.2.1 and another with 2.0.36.
>
> I have yet to try a different ethernet card in the Linux machine, however
> since the situation only occurs between IRIX & 2.2.1 and not
> 2.0.x <-> 2.2.1, I suspect it might be something other than the ethernet
> driver.
>
> It's hard to tell which end the problem is occuring. It's possible that
> something is causing the TCP connection to incorrectly throttle down to a
> slower speed. I would like to try and debug this further since I have
> access to this mix of equipment, but I was hoping I might get some insight
> on how to go about it and what to look for (possibly from a tcpdump
> session).
Running vanilla 2.2.1 on a i386 and IRIX 6.2 on an Indy I cannot reproduce
this problem; I'm running close to wirespeed in both directions. What IRIX
exactly are you running?
Ralf
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