Posted by Ilya Zakharevich on 01/19/08 07:41

[A complimentary Cc of this posting was sent to
Dave Martindale
<davem@cs.ubc.ca>], who wrote in article <fms15f$20c$1@swain.cs.ubc.ca>:
> >[AFAIK, maximal practically measured transfer rate of USB2 is
> > 33MB/sec. This (was claimed to) coincides with the maximal
> > theoretical transfer rate with some particlar small size of
> > buffer/window.]
>
> However, DV (and HDV) have a mean data rate of 25 Mbits/sec, or about 3
> MBytes/sec. That's less than 10% of the measured 33 MB/sec, so
> bandwidth should not be any more of a problem with USB2 than it is with
> Firewire, at least on a USB2 controller that is not currently being used
> by anything other than the video camera.

Sure. You could notice that this was already mentioned in the message
I replied to.

[I still hope I can spot a person who KNOWS the reasons for abysmal
performance of USB - comparing to Firewire...]

Yours,
Ilya

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