Hi,
RTAI guarrantees that jiffies are correctly accounted by Linux on the
average:
if (rt_times.tick_time >= rt_times.linux_time) {
rt_times.linux_time += rt_times.linux_tick;
rt_pend_linux_irq(0);
}
and from the above I cannot see any excess pending pending to Linux but
at linux_tick (11932) rate of HZ. In fact RTAI even helps in recovering
jiffies.
Your problem with get time of day is likely due to the cutoff of the
Linux reading the 8254 to get subjiffies times.
It is done by design since there is no chance anyhow of getting anything
meaningful from it once RTAI has grabbed the 8254. The ticking can be
whatever and so Linux must be happy with only its HZ resolution. Even if
it is not up to date the RTAI patch concepts are clearly explained in
README.RTHAL.
Within the above constraint I can bet that RTAI keeps its time very
well, while constraining LINUX to stay happy with just HZ resolution.
Many of the available examples show it.
Ciao, Paolo.
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