* 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
