>       It meets the spec when shipped but the bends, curves, temperature
> and other factors do affect the performance.  I guess a good way to test
> the cable is with FreeBSD since it's the only real OS I've seen that can
> do like real world speeds.  The only thing is that has anyone really saw
> 12 Megabytes/sec Full Duplex under FreeBSD?

If you mean mega = 1048576, it's impossible since this is faster than 100
Mbps whichever way you count it.

If you mean mega = 1000000, it depends on which way you're counting. The
"speed of light" for TCP, application to application, on 100 Mbps Ethernet
is 100 * 1460/1538 = 94.93 Mbps. This assumes full duplex.

I've measured 94.87 Mbps myself on full duplex 100BaseTX (back to back
with a crossover cable or through a switch).  This is close enough to
the "speed of light" that I see no point in trying to improve on it...

Steinar Haug, Nethelp consulting, sth...@nethelp.no


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