Hi all,
I now have a working system running with an SMP enabled kernel, including
the necessary drivers. I am getting some odd results both from latency-test
and running EMC. Here are the results I got from latency-test on xubuntu
without SMP enabled:
Max Interval Max Jitter
Servo Thread 1002816 6484
Base Thread 30998 7148
On the SMP kernel, I am generally getting worse results, and when I run my
configuration from the non-SMP kernel, I will get an overrun error at
startup that I don't get when run on the non-smp kernel.
Here are typical results:
Max Interval Max Jitter
Servo Thread 995748 6514
Base Thread 30712 6028
But I had one instance (run for 15 minutes or so) as good as:
Max Interval Max Jitter
Servo Thread 994058 5192
Base Thread 29517 4997
I have also had instances where Max Jitter exceeded 10000. The thing is, if
I get a high value, it happens right after I start latency test. It very
rarely will get larger than the initial large value.
So I am wondering if this is an anomaly of both the way latency-test and emc
/ realtime start up, or if the results are really that bad. The max interval
values are consistently better, plus watching last interval generally gives
values approximately averaging 991000 and 24750 respectively which are
better than when run on the non-smp kernel.
Regards,
Eric
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