Linux is not a hard realtime OS !
So no maximum latency can be specified. Even not for ISRs (there is no
spec how low at max the interrupt might be disabled). For Linux there is
just some _soft_ realtime spec, meaning that the probability for a delay
in lower than a certain value.
Kernel 2.4 is outdated and know for much worse soft realtime abilities.
2.6 is better and with 2.6.22 some more improvements have been implemented
If you need hard realtime you need to add things like RTAI or PikeOS.
-Michael
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