Am Dienstag, 16. Mai 2006 18:27 schrieb Adisorn Ermongkonchai:
> So I dig into the D-link USB driver (open source by Ralink) and
> found that it uses Bulk transfer mode. And the code seems to
> be reasonable. It calls "usb_fill_bulk_urb" with "usb_sndbulkpipe"
> and "complete" callback function and then calls "usb_submit_urb"
> to do the transmit. When "complete" callback is called, the
> transmit procedure is repeated if there are still packets in the
> queue.
>
> I check the "wMaxPacketSize", it is already set to 64 when the
> probe function is called. Is there anything that I could do to
> enhance the performance.
You must make sure that there's no time during which no URB is queued.
Submitting the next URB in the completion handler is too late. You should
maintain a reasonably sized pool of URBs.
Regards
Oliver
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