Hello, I do not know if this is the right mailing list to ask this question, if this is not, please apologize and tell me where I could ask for this information. I am trying to do my first tests with PREEMPT_RT on my BeagleBoneBlack board. I am testing it with cyclictest and in the meanwhile I am copying a big file from /home/roor to /tmp to stress the system. I have two options at the moment, a standard kernel and a PREEMPT one. I've got the kernels from https://github.com/beagleboard/linux.git using two different branch/tag as described below. The result of my tests seems to indicate a not RT kernel and any RT performance. My questions are: - How can I detect during runtime that my kernel was properly configured for RT performances? - Should I see any message in dmesg or at boot related to "Ingo Molnar"? - Are the performances detected above with cyclictest the correct way to measure RT performances? * Standard version --------------------- root@beaglebone:~# uname -a Linux beaglebone 4.1.6-yocto-standard #2 PREEMPT Thu Dec 3 16:13:24 CET 2015 armv7l GNU/Linux root@beaglebone:~# cat /proc/config.gz | gunzip | grep PREEMPT CONFIG_PREEMPT_RCU=y # CONFIG_PREEMPT_NONE is not set # CONFIG_PREEMPT_VOLUNTARY is not set CONFIG_PREEMPT=y CONFIG_PREEMPT_COUNT=y CONFIG_DEBUG_PREEMPT=y # CONFIG_PREEMPT_TRACER is not set root@beaglebone:~# ./cyclictest -t1 -p 80 -n -i 10000 -l 10000 T: 0 ( 384) P:80 I:10000 C: 1141 Min: 14 Act: 16 Avg: 239 Max: 42402 * RT version -------------------- (git checkout tags/4.4.7-ti-rt-r19 -b 4.4.7-ti-rt-r19) root@beaglebone:~# uname -a Linux beaglebone 4.4.7 #2 SMP PREEMPT RT Thu Apr 21 14:48:58 CEST 2016 armv7l GNU/Linux root@beaglebone:~# cat /proc/config.gz | gunzip | grep PREEMPT CONFIG_PREEMPT_RCU=y CONFIG_PREEMPT=y CONFIG_PREEMPT_RT_BASE=y CONFIG_HAVE_PREEMPT_LAZY=y CONFIG_PREEMPT_LAZY=y # CONFIG_PREEMPT_NONE is not set # CONFIG_PREEMPT_VOLUNTARY is not set # CONFIG_PREEMPT__LL is not set # CONFIG_PREEMPT_RTB is not set CONFIG_PREEMPT_RT_FULL=y CONFIG_PREEMPT_COUNT=y CONFIG_DEBUG_PREEMPT=y # CONFIG_PREEMPT_TRACER is not set root@beaglebone:~# ./cyclictest -t1 -p 80 -n -i 10000 -l 10000 T: 0 ( 302) P:80 I:10000 C: 6297 Min: 13 Act: 19 Avg: 159 Max: 40226 Thank you in advance for your help. -- Mauri -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
