Thanks, now i can read more data in one packet. And
now I want to know that whether it is possible to set
the device speed as i just discovered that my camera
is connected as FullSpeed device instead of HighSpeed
device? This device is suppose to be connected as
HighSpeed device. Thanks!!
rdgs,
shejian..
--- Fernando Urbina <email@hidden> wrote:
> Actually, for maximum performance you want to have
> more than one
> outstanding reads. You should also read more than
> 4K at a time,
> that's seems awfully small when getting lots of
> data. Be sure that
> you request a maxPacketSize multiple in your Read.
>
> Finally, the # of bulk transactions that can be send
> per frame has to
> do with (1) other traffic on the bus and (2) the
> architecture of the
> machine and the controller being used. Hence, you
> can't compare
> Apples and Oranges.
>
> A bus analyzer trace showing your traffic could give
> you clues in how
> much the bus is being utilized.
>
> Good luck,
>
> --
> Fernando Urbina
> USB Technology Team
> Apple Computer, Inc.
>
> On Apr 22, 2005, at 1:14 AM, Florent Pillet wrote:
>
> > The obvious question is: do you immediately fire a
> new Read from
> > inside the read completion callback? that's what
> you should do for
> > maximum performance.
> >
>
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