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    SubjectRe: BogoMIPS revisitied...MMX

    Here is an interesting array:

    AMD K5-100: 199.07 BMPS
    INTEL P-60: 23.96 BMPS
    Cryix 6x86 P150+ (at 120MHz): 52.33 BMPS
    INTEL 486-DX266: 33.08 BMPS.

    Why is the AMD 100MHz CPU 4x faster (in BogoMIPS) than a Cyrix running a
    20% higher clock speed? I would say that the AMD CPU Microcode is
    optimized more toward the type of instruction that the bogomips loop
    executes. Why is it nearly 10x faster than the Intel chip?

    I dunno, but I think I will buy more AMD chips ;)



    On Tue, 17 Mar 1998, Perry Harrington wrote:

    > Ok, I wouldn't ask this question if I didn't think that there was
    > more going on here.
    >
    > I have a P100 Toshiba laptop. It's your average P100 mobile 2.9v
    > processor. I recently purchased a P233MMX as well.
    >
    > The thing that baffles me is this:
    >
    > I know that the bogomips loop is a >small< and tight loop of 3 or
    > 4 instructions. Why is it that my P100 spits out something like
    > 39.19 BogoMIPS and my P233MMX spits out 466.15 bogomips? I know
    > that the Pentium had some issue with this, being that a standard
    > 486 executed *that* particular loop faster.
    >
    > So, why such the HUGE difference?
    >
    > --Perry
    >
    > --
    > Perry Harrington Linux rules all OSes. APSoft ()
    > email: perry@apsoft.com Think Blue. /\
    >
    > -
    > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    > the body of a message to majordomo@vger.rutgers.edu
    >
    >

    George Bonser
    Just be thankful that Microsoft does not manufacture pharmaceuticals.
    http://www.debian.org
    Debian/GNU Linux ... the maintainable operating system.


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