Interrupt latency test bench on RTAI (StrongArm port)
clement.moreau at inventel.fr
Thu Aug 1 16:59:17 CEST 2002
On our own StrongArm based board, we need a good latency on one external
I decided to use RTAI 24.1.9 over linux-2.4.17 because i could not achieve
this latency with linux-2.4.17 alone.
I have done a test bench of the gpio irq latency, and i found that the mean
latency is very good (about 5 us), but the worst case latency is not good :
over 300 us.
My setup is : an external timer, that generate a rt irq each 1 ms.
There is no rt task, no other rt irq, but a lot of linux irqs.
It seems that our ethernet chip linux irq (cs8900, with standard arm linux
driver) is disturbing real time irq process.
Is it possible ?
Does any body have the same problem or know the solution ?
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