On 04/30/2013 03:27 AM, Ashoka K wrote:
Hi, I have an embedded system running 2.6.33 cross compiled for ARM OMAP with 1 GHZ uni-processor system.
A project I am working on is using the same vintage kernel with RT patches applied, though on DaVinci (omap l138).
I, myself, however, have not dealt with any of that work, but I will ask the other developer if he has any suggestions.
The application has many threads and processes (around 15 total). In that 1 thread is time critical and must run every interval confiurable as 2, 4 or 8 milli sec etc. There is another thread which transfers Images to a FTP or to HMI etc, whoever requested the image. With this image transfer enabled my critical process misses the deadline and timesout. This critical thread is at RR priority 50. I used a HR timer thread with RR pri 55 to wakeup the critical thread every 1 milli sec to do the job. If image transfer is enabled i see that real time thread misses deadlines. All traffic is flowing on common ethernet connection. Does it affect in any way ? How to find out where the kernel is waiting or delaying to schedule the critical thread even though it is at higher RR priority. How to measure the latency ? I am trying to use Oprofile tool, but got some error in cross compiling. Doesn't these tools add their own latency to the original problem ? Any tools ? which one is better. Please provide your input on this. Regards Ashoka. K -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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