Re: [processor frequency]

[Wolfgang Denk <wd@denx.de>]

In message <005a01c614fb$2fe76b00$10eca8c0@grendel> you wrote:
> There is no "ideal" value for a given processor frequency.
> The lower the value, the less interrupt processing overhead,
> but the slower the response time to events that are detected
> or serviced during clock interrupts. 1000 HZ *may* be a sensible
> value (I have my doubts, personally) for 2+ GHz PC processors, 
> but it's excessive (IMHO) for a 200MHz processor and unworkable 
> for a 20MHz CPU. I think that 100HZ is still a reasonable value
> for an embedded RISC CPU, but the "ideal" value is going to
> be a function of the application.

We did some tests of the performance impact of 100 vs. 1000 Hz  clock
frequency on low end systems (50 MHz PowerPC); for details please see
http://www.denx.de/wiki/view/Know/Clock100vs1000Hz

Best regards,

Wolfgang Denk

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