* kus Kusche Klaus <[email protected]> wrote:
> I've written a small test program which enables periodic RTC
> interrupts at 8192 Hz and then goes into a loop reading /dev/rtc and
> collecting timing statistics (using the rdtscl macro).
getting /dev/rtc handling right for latency measurement is ... tricky.
The method i'm using under PREEMPT_RT is:
chrt -f 84 -p `pidof 'IRQ 0'`
chrt -f 95 -p `pidof 'IRQ 8'`
./rtc_wakeup -f 1024 -t 100000
you can get rtc_wakeup from:
http://www.affenbande.org/~tapas/wiki/index.php?rtc_wakeup
written by Florian Schmidt.
do you see high latencies even with rtc_wakeup?
Ingo
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