[Guy Harris <guy@xxxxxxxxxx>]

> Hmm... wonder what it would take to be able to sniff on a 
> PCI bus:)

Hardware assistance, but we've used, here at NetApp, a PCI analyzer that
consisted of, I think, a peripheral you plug into a PC, plus software
for Windows.  (I suspect the stuff that needs to be done Really Fast
with Really Low Latency is done by the hardware.)

We also have Fibre Channel analyzers and, I think, parallel SCSI
analyzers as well.  Those presumably had specialized hardware.

(Maybe I should go look at the Infiniband specs we have here and see
whether there's any sort of promiscuous Infiniband sniffing possible,
although I think Infiniband is switched so you might have to do some
Special Stuff to sniff traffic - and it probably requires hardware
assistance to buffer records for bus transactions for the software to
read.)