Let's see the code.
On Mon, May 01, 2000 at 05:49:56PM +0200, Stefan Uhlig wrote:
> Hi all!
>
> I have a problem serving interrupts via RT-Linux.
>
> I developed a small driver to acquire Data from the parallelport.
> Every Byte comes in with one interrrupt, which is fired by the /ACK-Line.
>
> I found out that, if the CPU-load ist quite high, the interrupts are not all served
>and a loss of data is recognized. This problem even appears at low interrupt rates at
>about 1kHz.
>
> How is this possible? My interrupt service routine only saves ONE byte and then
>enables the interrupts, again!
>
> But i can definitely say, that there is a loss of data at high CPU load, because i
>count the ISR-calls and calculate the interrupt-rate throuth a periodic thread
>(1000000000ns).
>
> If the interrupts are not all correctly served at higher load, it makes no sense to
>use RT-Linux!!!
>
> Please help if you know the cause!!!
>
> Thanks,
>
> Stefan
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