From: Tom St Denis <stdenis AT compmore DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Reading MSR (Athlon multiplier)
Date: Thu, 18 Jan 2001 12:44:31 GMT
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In article <945mn8$cjroo$1 AT ID-57378 DOT news DOT dfncis DOT de>,
  "Alexei A. Frounze" <dummy_addressee AT hotmail DOT com> wrote:
> "Tom St Denis" <stdenis AT compmore DOT net> wrote in message
> news:945itn$3ai$1 AT nnrp1 DOT deja DOT com...
> > In article <945a90$ckgq1$1 AT ID-57378 DOT news DOT dfncis DOT de>,
> >   "Alexei A. Frounze" <dummy_addressee AT hotmail DOT com> wrote:
> > > right, you can use RDTSC for getting CPU speed. But RDTSC can be
> disabled in
> > > user mode (e.g. Privilege Level 3) by an OS.
> > > for instance, the following code works fine on my Celeron566 imder winME
> and
> > > gives 564-566MHz:
> >
> > Works somewhat cool, I got 807Mhz on my 800Mhz TBird Athlon.
>
> Glad to hear that a program I made in around 15 mins, works for you too. :)

You should calc for the stack overhead.  I.e do something like

mov ebp,128
l1:
rdtsc
push eax
push edx
rdtsc
pop eax
pop edx
add ebx,eax
adc ecx,edx
dec ebp
jnz l1:
shrd ebx,ecx,7

(overhead in ecx::ebx)

Tom


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