poornima r wrote:
Hi,
I was able to run latency and switchbench tests on
MPC860 board with IPIPE tracer feature
enabled/disabled.
Nice, what versions of Linux and Xenomai did you use for your tests? It
is known that Linux 2.6 does not yet work properly for 8xx. It would
also be nice if you could briefly post your results on this list as well.
Interrupt & scheduling Latencies and switching
latencies (with IPIPE tracer option disabled) were
having lower values when compared to latency values
with IPIPE tracer enabled.
The ipipe tracer introduces some overhead (extra code) and as this CPU
is very slow, you will notice it.
cyclictest test results were same with or without
IPIPE tracer enabled.
Your results would really be of interest.
Is this reduced context switching latency in
switchbench test due to timer interrupt?
Likely it also due to overhead introduced by the ipipe tracer.
BTW: the switchtest should run as well with the option "-n" (for not
using the FPU),
Wolfgang.
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