Malte Mundt(deleted)
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Re: Interrupt Latency on AT91SAM9263
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Malte Mundt(deleted)
05/12/2009 12:12 PM
post29280
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Re: Interrupt Latency on AT91SAM9263
> > A potential customer is seeing 8us interrupt latency, using 6.3.
>
> Are you talking about ISR or IST latency?
ISR. IST of course is longer (35 us), but the question is specifically about ISR.
> > What ways are there to improve interrupt latency?
> >
> > 1) is 6.4 expected to significantly improve interrupt latency (e.g. because
> of large page? does large page exist on ARM9 anyway) ?
>
> > 2) is it possibly to "bypass" the kernel for 1 certain interrupt source by
> hacking around in the callouts (startup code)?
>
> That's getting pretty extreme...
Yes, of course first we should look at 1), and also at interrupt callout optimizations in the BSP, if possible?
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