Re: Win95 performance counter interface?

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Article #23446

#23446

From: LKS
Date: Sat, 28 Nov 1998 00:00

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Brandon Van Every wrote:
> 
> Does Win95 have an API interface to SET UP the Pentium II performance
> counters?  i.e. a built-in method to indirectly execute the Ring 0 WRMSR
> instruction?

you can use the Win32 API

  QueryPerformanceCounter
  QueryPerformanceFrequency

(needs kernel32.lib and winbase.h)

or more directly the RDTSC instruction (I know this exists on the
Pentium, but I'm not sure about P II).  This returns the number of clock
cycles executed since power-up in EDX:EAX but I don't know if there's a
sensible way to get the frequency without doing a bit of timing and
counting yourself..

-lks

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From: LKS <lk213@hermes.cam.ac.uk>
Subject: Re: Win95 performance counter interface?
Date: 1998/11/28
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