[ECOS] Tsim with eCos

Michele Portolan michele.Portolan@imag.fr
Mon Aug 25 13:01:00 GMT 2003


I'm using TSIM (evaluation) to test eCos2.0 on leon.
I'm running the "tm_basic" test to obtain basic timing information with
different system clocks, but there is a thing I cannot understand: I always
get the same result. How is it possible?
Even a "diff" operation on the two complete outputs gives nothing: they are
strictly the same!
For example I am monitoring context switch time, and i get the following
line at both 50 and 16 Mhz:

                                 Confidence
     Ave     Min     Max     Var  Ave  Min  Function
  ======  ======  ======  ====== ========== ========
....
  14.44   14.00   18.00    0.51   58%   58%  Thread switch

Above it is stated that "all times are in microseconds (.000001) unless
otherwise stated"
I'm sure TSIM is correctly set because if I enter "perf" I get "CPU
performance (16.0 MHz)" in one case and "CPU performance (50.0 MHz)" in the
other.

By the way, what does the parameter "confidence" means?
Thanks,

Michele Portolan


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