Re: Nice Work.

[Philippe E. <ph...@cl...>]

From: "MONTGOMERY,BOB (HP-FtCollins,ex1)" <bob...@hp...>
Sent: Tuesday, March 05, 2002 6:06 PM

...

> Bob M.
>
> P.S. for you P4 experts: Is there a counter for CPU clocks in that design
> for simple-minded time-based profiling?  I took an overly quick look at an

Look at 24896604.pdf "Intel Pentium 4 and Intel Xeon processor
optimisation" appendix B. It describe the trick to get clock count.
This appendix is *the* reference on how to build PPro like
events based on the top of P4 hardware. IMHO a right profiling
tools for P4 must expose two interface for user for the P4, one
abstracting the  hardware giving a more intuitive interface and
another exposing the low level stuff mainly for experimentation

> Intel manual and didn't see it.  I thought about trying a quick and dirty
> time counter implementation to solve our current profiling needs, and
> someone else could do a full-featured port later.  We're not playing with
> P4's in my group right now, but we've had some requests, and I mentioned
to
> the requestors that hardware donations to the open source world can often
> get results. (Ahem...)

I confirm, that's *really* true.

regard,
Phil