From: "Alexei A. Frounze" <dummy_addressee AT hotmail DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Reading MSR (Athlon multiplier)
Date: Fri, 19 Jan 2001 10:20:16 -0500
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

"Tom St Denis" <stdenis AT compmore DOT net> wrote in message
news:9493kh$20s$1 AT nnrp1 DOT deja DOT com...
> In article <83ae8om8xh DOT fsf AT mercury DOT st DOT hmc DOT edu>,
>   Nate Eldredge <neldredge AT hmc DOT edu> wrote:
> > Tom St Denis <stdenis AT compmore DOT net> writes:
> >
> > > Hmm loser:  I don't have a 807mhz processor. Your code is wrong.  A
program
> > > that says 1+1=3 is wrong despite being coded flawlessly in perfect
ANSI C.
> >
> > How do you know?  800 MHz is only a nominal speed; the speed at which
> > the processor actually runs can vary from that significantly.
>
> If that were true then I should get 793Mhz from his code once in a while
to.

It may not happen. Nobody said it should be a symmetrical fluctuation. It
may be shifted towards higher or lower values due to various reasons.


> Consistently biased is not biased, it's errored!

Nope. You do not know fo sure.


> Besides directx can say "800mhz" why can't his code?

Because:
1. DX may not really measuer this frequency (I'm not expert here, but this
is possible)
2. DX runs in privilege level 0 and thus can disable all those irrelevant
things while measuring the frequency
3. Nobody said that 800MHz is the frequency you have on the CLOCK pin of
your CPU (it may be both a little bit higher or lower). And if you'll try to
say that BIOS prints out this value correctly, I'll argue this. Because BIOS
definetely has access to resources and signals on the motherboard and thus
it can acquire settings of switches and instead of measuring it may conver
them into frequency by using a look-up table or something similar.
4. Again, nobody said, that the timer in your computer generates impulses at
exactly 1193180Hz rate - there can still be certain limited accuracy.
Perhaps you may improve this by using RTC generator instead.

Just try to run the program in DOS or boot from the "emergency diskette" and
run in this environment. Report what you get there.

--
Alexei A. Frounze
alexfru [AT] chat [DOT] ru
frounze [AT] ece [DOT] rochester [DOT] edu
http://alexfru.chat.ru
http://members.xoom.com/alexfru/
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