On Fri, 2009-07-24 at 23:41 +0530, Sbs wrote:
> Hi All,
>
> (Sorry if I am asking this on a wrong list. Please let me know the
> correct list for this question)
>
> We have a system which needs to be connected to a device that will
> produce an interrupt during every msec. So, we want interrupt
> latencies less than 1 msec (else we will miss interrupts). We tried
> measuring interrupt latencies with RT patch applied. However, the
> results that he got suggested that after applying patches, the worst
> case latency went up.
>
> From what I read and understood from the site is that, the patch will
> cause this kind of behaviour. Is this correct? (" Converting interrupt
> handlers into preemptible kernel threads:" - RT wiki FAQ) I have seen
> some other site mentioning about rtirq patch (for 2.4). What is good
> for my scenario? Should I apply an RT patch at all? Or is there
> something else that I need to see?
>
Did you raise the priority for the 1 ms IRQ thread?
> Thanks in advance,
>
> Regards,
> Sbs
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