Posted by Nomen Nescio on 01/22/08 18:20

Ilya Zakharevich wrote:

> > The USB bus isn't interrupt-driven -- it's polled (as I wrote),
>
> Do not see any significant difference. The poller would set up a
> wake-up call, which would generate an interrupt. [And, BTW, why my
> PCI hardware view shows that USB controllers use interrupts?]

Wow. You are one thick headed individual. Perhaps an analogy....

An Interrupt driven system would be like me using a baseball bat to get
your attention, and then telling you what to do.

A polled system would be like me wasting my time standing around
waiting for you to muddle through the jumble of "thoughts" in your head,
until you finally looked up with a blank stare on your face and asked
me what to do.

> > which is why latency can be an issue.
>
> Could you explain how latency is related to polling?

Could you explain how it's NOT?

Sheesh!

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