Am Donnerstag, 21. Dezember 2000 09:04 schrieben Sie:
Thanx for quick response.
> It's possible that on rare occasions Linux will have run a task that used
> the FPU so RTL must save FPU state when running your task. That's a very
> expensive operation and may account for your occasional longer run-time.
>
May be. The runtime of the floating point section varies from less than 50 us
to 500 us in rare occasions. Its unbelievable but that's what I can see on my
scope. (And in the error detection of the software :-)
> You can test this by dropping some conpr's in the FPU switch code when
> Linux owns the fpu. Let me know what it tells you.
Maybe I'll do this later. For now, I fixed my actual problem by moving the
code into a non time critical section of my application and using integer
arithmetics for that calculation instead of floats.
By, Michael
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