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From: David Mosberger <davidm@napali.hpl.hp.com>
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Date: Sun, 23 Feb 2003 15:59:12 -0800
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: davidm@hpl.hp.com, Linus Torvalds <torvalds@transmeta.com>,
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>>>>> On Sun, 23 Feb 2003 15:06:56 -0800, "Martin J. Bligh" <mbligh@aracnet.com> said:

  Linus> Last I saw P4 was kicking ia-64 butt on specint and friends.
  >>  I don't think so.  According to Intel [1], the highest
  >> clockfrequency for a 0.18um part is 2GHz (both for Xeon and P4,
  >> for Xeon MP it's 1.5GHz).  The highest reported SPECint for a
  >> 2GHz Xeon seems to be 701 [2].  In comparison, a 1GHz McKinley
  >> gets a SPECint of 810 [3].

  Martin> Got anything more real-world than SPECint type
  Martin> microbenchmarks?

SPECint a microbenchmark?  You seem to be redefining the meaning of
the word (last time I checked, lmbench was a microbenchmark).

Ironically, Itanium 2 seems to do even better in the "real world" than
suggested by benchmarks, partly because of the large caches, memory
bandwidth and, I'm guessing, partly because of it's straight-forward
micro-architecture (e.g., a synchronization operation takes on the
order of 10 cycles, as compared to order of dozens and hundres of
cycles on the Pentium 4).

BTW: I hope I don't sound too negative on the Pentium 4/Xeon.  It's
certainly an excellent performer for many things.  I just want to
point out that Itanium 2 also is a good performer, probably more so
than many on this list seem to be willing to give it credit for.

	--david
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