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

[A complimentary Cc of this posting was sent to
John Navas
<spamfilter1@navasgroup.com>], who wrote in article <cj44p3t4f03goqbh2taphug458m1ck0of4@4ax.com>:
> The primary issue, as I've noted previously, is not speed, but that
> Firewire is designed for continuous independent bus transfers, whereas
> USB 2.0 is not, with all USB transfers controlled by the host by means
> of polling. That can result in small USB transfer pauses when the host
> gets busy. (Ever notice how a USB mouse pointer will sometimes move
> erratically?)

No. I do not see how the effect you describe can appear; device
drivers should not be affected by the "system being busy"; an
interrupt is an interrupt is an interrupt. I may be missing more
technical details...

Yours,
Ilya

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