call for testers: busdma-ified fxp(4) driver

[Andrew Gallatin]

Fred Clift writes:
 > 
 > before: throughput in 10^6 bits/sec  39.18
 > after: throughput in 10^6 bits/sec   94.11
 > (dc):  throughput in 10^6 bits/sec   70.97
 > 
 > 
 > Honestly I'm suprised there is so much difference between the before and
 > after and I'm doubting my testing methodology -- perhaps I had the duplex

My guess is that the old kernel has WITNESS enabled and the new kernel
does not.  

Even a 600MHz 21264 is maxed out at 75Mb/sec with WITNESS enabled.
50% idle without.

Drew