On Wednesday November 16, [EMAIL PROTECTED] wrote: > > 64 bytes is probably best. You don't lose any FSBR performance, because > FSBR isn't turned off immediately when an URB completes.
Ok, I'll get some new clean traces, but probably not until some time next week. > > That's what I'd like to understand. Even with FSBR on all the time, it > still takes more than 1000 ms to transfer 128 packets (i.e., 8192 > bytes)? Do the packets get sent in fixed-size clumps, or is it more > random? With 64byte writes, there is usually a 112msec delay, sometimes none, sometimes double. See other email. With 8192byte writes, I cannot watch the individual packets, but each 8k urb suffers from 1 to several 112msec delays, which suggests there is clumping within a small window ever 112msecs. > > If the printer was at all sane, it wouldn't take more than 300 ms to > transfer that much data even with FSBR permanently off! I think we can agree the printer is not sane. If it wasn't that I have found other reports of UHCI problems with this printer, I would assume my particular printer had a defect and return it to HP. Maybe I will anyway. > > > But I'm happy to redo some tests to be able to give > > you clear before/after results. It'll probably have to wait a week or > > so, as I've spent more time on this that I really should have lately. > > It might be more interesting to find out how the printer manages to work > more quickly under Windows (assuming it does, of course). If you want to > spend the time, you could try tracing some of that communication. I won't be doing this in the near future, but I am curious, and may give it a try in a few weeks. Thanks, NeilBrown ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today Register for a JBoss Training Course. Free Certification Exam for All Training Attendees Through End of 2005. For more info visit: http://ads.osdn.com/?ad_id=7628&alloc_id=16845&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
