In reply to Mike Hunter <[EMAIL PROTECTED]> : > On Jan 30, "To [EMAIL PROTECTED]" wrote: > > > Hi, > > [snip] > > I switched the two pieces of hardware, and the photons still prefer going > uphill, so maybe there's a problem with the fiber after all. I'd still > appreciate any hints on what to ask freebsd to help me figure it out. > (Yes, we have real fiber test gear, this is more of an experiment.)
Have you looked at interface error counts? (netstat -inbd) If you
have dirty fiber, you could just be missing/corrupting the odd packet
here and there, which would be enough to impact a high-bandwidth TCP
flow.
the other thing to check is if a UDP cannon has the same bandwidth
asymmetry, since the UDP iperf tests don't have TCP's timidity (if
memory serves me)....
--eli
>
> Thanks,
>
> Mike
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