Help, VERY, VERY strange RTEMS execution time...

[Alex]

Hi all,

I am trying to measure execution time of the clock_getres() POSIX fucntion.
To archive that I made the following rtems posix program:


Do 10 times
	get ticks using RDTSC
	call clock_getres fucntion	
	get ticks using RDTSC
	calc the execution time
	store it in an array
end do

write array to FAT file

end
	

Then I run the program in a i686 computer, with cache desabled, I got the
following values (in ticks units):

461
54
56
56
56
54
56
56
56
56

My question is:

Why the first value is diferent from the others? Where is determinism?
Cache is desabled and I also strip the executable but I can't understand that value... 

Any sugestions?


Thanks,

Alex

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