u want real time behaviour use the pru ! Le ven. 1 avr. 2016 à 03:15, Victor WANG <[email protected]> a écrit :
> Hi John， > > Thanks so much for your response, as you said, it is true that there is no > load for the CPU. It is well of getting this result, thanks again. > > Regards, > > Victor > > 在 2016年3月31日星期四 UTC+8下午2:49:24，john3909写道： >> >> I would say that avg latency of 32uS is very good and I would be >> skeptical of this result. I don’t know what cyclictest does, but I’m >> wondering what the CPU load is during this test. My guess is the CPU load >> is low and that is why you are getting 32uS. If the CPU load was high, I >> would expect the number to increase to 100uS or more. Even Xenomai, which >> has a dual kernel is only able to achieve 40uS under load. >> > >> Regards, >> John >> >> >> >> >> On Mar 30, 2016, at 11:38 PM, Victor WANG <[email protected]> wrote: >> >> hello, >> >> I use beaglebone black and install Linux Debian (*Linux beaglebone >> 4.4.6-bone-rt-r6 #1 PREEMPT RT Thu Mar 17 04:47:32 UTC 2016 armv7l >> GNU/Linux*), I want to test the characteristic of Real Time, so I use >> cyclictest: >> >> After "*cyclictest -p 90 - m -c 0 -i 200 -n -h 100 -q -l 10000*", I got: >> >> *# Total: 000010000* >> *# Min Latencies: 00012* >> *# Avg Latencies: 00032* >> *# Max Latencies: 00053* >> *# Histogram Overflows: 00000* >> *# Histogram Overflow at cycle number:* >> *# Thread 0:* >> >> The result means the average latencies is 32 us. >> >> I wonder if it is normal or not? (In my opinion, it is a little wired, >> because with the RT-preempt patch, it should be better than it.) >> >> And if there is something wrong in the process, please tell me . >> >> Thanks so much. >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> >> >> For more options, visit https://groups.google.com/d/optout. >> >> -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
