Dan:
While you're looking at usb_calc_bus_time, check out the following two
lines from usb_check_bandwidth:
if (is_iso)
bustime /= urb->number_of_packets;
I don't understand this at all. bustime was computed based on the
maxpacket size; it should have nothing to do with the number of packets in
an ISO transfer. Furthermore, bandwidth calculations are always done
per-frame, whereas different ISO packets from an URB are sent in different
frames (when running at full speed).
Alan Stern
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