Re: Raspberry Pi, Real-Time and Ada

["Rego, P." <pvrego@gmail.com>]

On Saturday, February 8, 2014 5:56:02 AM UTC-3, Dmitry A. Kazakov wrote:

> That looks pretty much slow for a 700MHz processor. You should take a look
> what exactly the implementation is (in s-oprim.adb, I suppose).

The Ada implementation? 

> If you look at the implementation of you see that it is based on the
> performance counter:
> http://msdn.microsoft.com/en-us/library/windows/desktop/ms644904%28v=vs.85%29.aspx

ok

> MS does not tell which time source they use for this function. There are
> many on an Intel board. That you have 0 to 366ns (which is very poor for an
> Intel machine) indicates that probably your machine uses the HPET. HPET
> runs at 25MHz or so, which is pitiful for a GHz machine.
What is HPET?

> I suppose there are some architectural problems with using the TSC on
> multi-core machines which is why older single-core Windows machines tend to
> have better clocks.
Mine is an I7.

> Anyway, you could try to play a bit with the BIOS and BOOT.INI in order to
> force Windows not to use HPET (or even worse, the programmable timer).

Ok. I will try.

Regards