On 08/17/11 12:10, Sankara Muthukrishnan wrote: > On Wed, Aug 17, 2011 at 11:54 AM, Sankara Muthukrishnan > <sankara.m@xxxxxxxxx> wrote: >> The cyclic test results are not acceptable (attached the output of >> cyclictest). I am seeing maximum latency of 757 us on core-0 and 1905 >> us on core-1. Are you (Is anyone) seeing better results on latency >> with SMP kernel with RT patch on ARM (OMAP4 processors)? I have seen >> ~25 us of latency with single core kernel (though I have used a >> different kernel configuration). >> > > Never ever mind and sorry for the confusion. I did not realize that > "Kernel debugging" was enabled in the config Frank had attached. With > kernel debugging disabled, I see max latencies less than 20 us on both > cores on panda board with cyclictest (cyclictest -l1000000 -m -Sp99 > -i200 -h60 -q -n) in my quick run and it is exciting to see these > numbers. Thanks Frank. > > The only other outstanding problem as of now is that the RT kernel > hanging during boot on panda board (boots sometimes after several > resets and/or power-cycles). I just sent a couple of patches in reply to "[ANNOUNCE] 3.0.1-rt11". They might help resolve your panda board hang on boot. -Frank -- 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
