[fedora-arm] smsc95xx performance bug: eth vs usb

[DJ Delorie]

I put tcpdump traces here:

http://www.delorie.com/tmp/usb-yes-pings.gz
http://www.delorie.com/tmp/usb-no-pings.gz
http://www.delorie.com/tmp/lsusb.txt

(my panda doesn't have /proc/bus/usb for some reason)

Note: I also have a USB protocol analyzer (www.totalphase.com) which I
can do wire-level USB dumps from, if that would help.  They're *big*
though.