Re: MSR/performance monitoring for PPro

David Wragg (dpw@doc.ic.ac.uk)
17 Jan 1999 22:48:59 +0000

Richard Gooch <rgooch@atnf.csiro.au> writes:
> Hi, all. While trying to track down the source of variability in a
> memory-intensive task (running on a PPro), I've been trying to gain
> access to the CPU performance monitoring facilities. I've trawled the
> Intel developer's WWW site and all I can come up with is a document
> for the Pentium and Pentium/MMX which discusses this. There I see that
> MSR# 0x11 is the "Control and Event Select Register". However, any
> attempts to read or write this register result in a general protection
> fault.
> [snip]
> So it looks like I need a list of MSRs specifically for the Pentium
> Pro. Does anybody have such a list, or a URL I can use?

The "Pentium Pro Family Developer's Manual Volume 3: Operating System
Writer's Guide" (document number 242692) has an appendix on the
performance monitoring counters, and a full list of MSRs (well, except
for the ones they kept secret). On the Intel website they seem to have
superceded this with an equivalent document for the whole P6 range,
but that probably has the same information. If not, mail me for the
old one.

I don't see MSR 0x11 in the list.

Dave Wragg

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