Re: 1 or 2 MHz interrupt on PC
Date: 2001-05-08 02:04:51

On Mon, 7 May 2001, Ruud Baltissen wrote:

> Hallo allemaal,
> Maybe a strange, even weird question but would a 1 or 2 MHz interrupt be
> possible on a fast PC?

QNX, a 'real time' OS for PCs "boasts" a 6 microsecond response time to
interrupts.  a 1mhz interrupt needs a MINIMUM 1 microsecond response time,
PLUS time to do the work, and prepare for the next interrupt.

> I have done some interrupt programming my self but not for these high
> speeds. So I never questioned how much cycles a PC will need at minimum. If
> somebody knows, please tell me.

I'm not aware of how many cycles, but I know that the instruction cache
needs to be dumped and reloaded, state saved and reloaded, etc.

> The above is not off-topic. I need this info for a little project Nick and I
> are discussing. When the time is ripe, we'll inform you about it.

Not even a hint?

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