thanks, william. I first went an easier route. I did create a 16MB random
file on the host desktop, and rcp'ed it to a ramdisk on the BBB over usb.
I am getting about 4MB/sec. then I went the iperf route. your memory was
excellent, except the -C switch for the client is -c. this also reports a
bandwidth of about 30 Mbaud.
so, on my simple experiments (linux metal desktop, bbb rev c usb), here are
my transfer speed comparisons (all in MBaud = MBit/s):
serial over usb : < 10
mass storage over usb : ~ 20
ethernet over usb : ~ 30-40
theoretical usb speed : ~ 480
local eMMC speed : ~ 70
I wonder if I can figure out how to send raw messages over USB with
usb_bulk_msg() on the host without a higher level protocol (ethernet, usb
mass storage, serial). has anyone written already a simple "echo" script
for the BBB that just responds to usb_bulk_msg requests and prints summary
info on the console?
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