Am Montag, 18. April 2005 04:37 schrieb Alan Stern:
> On Sun, 17 Apr 2005, David Brownell wrote:
>
> > So basically this was a usb-storage measurement. That's probably a
> > worst-case from the HCD perspective, since virtually everything else
> > only uses very short queues. (Other than "usbnet", which at full
> > speed uses shorter queue lengths; or usb audio, which usually keeps
> > only two ISO transfers of a handful of msec each.) Only usb-storage
> > is routinely queueing more than a dozen KBytes or so (at full speed).
>
> Yes, this was a usb-storage measurement. That's the only sort of
> devices I have that make serious demands on the HCD. And this _was_
> supposed to be a worst-case measurement, after all.
The worst case for latency? Then you should measure with a driver
that does a lot in the completion handler, eg. audio.
Regards
Oliver
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