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    SubjectRe: [RFT] Port 0x80 I/O speed
    On Wed, Dec 12, 2007 at 01:57:01PM +0200, Ville Syrjälä wrote:
    > On Wed, Dec 12, 2007 at 12:31:18AM +0100, Rene Herman wrote:
    > > Good day.
    > >
    > > Would some people on x86 (both 32 and 64) be kind enough to compile and run
    > > the attached program? This is about testing how long I/O port access to
    > > port 0x80 takes. It measures in CPU cycles so CPU speed is crucial in
    > > reporting.
    >
    > vendor_id : GenuineIntel
    > cpu family : 6
    > model : 15
    > model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz
    > stepping : 6
    >
    > cpu MHz : 2394.000
    > cycles: out 1830, in 1166
    >
    > cpu MHz : 1596.000
    > cycles: out 1925, in 1266

    BTW that was my home desktop. I just noticed that my work desktop gives out
    significantly different results.

    vendor_id : GenuineIntel
    cpu family : 6
    model : 15
    model name : Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz
    stepping : 6

    cpu MHz : 2667.000
    cycles: out 4263, in 2487

    cpu MHz : 1600.000
    cycles: out 4391, in 2623

    There seems to be more variation in the results between runs on this system
    too. I suppose the difference must be up to the chipset.

    My home system:
    00:00.0 Host bridge: Intel Corporation 82P965/G965 Memory Controller Hub (rev 02)
    00:1f.0 ISA bridge: Intel Corporation 82801HB/HR (ICH8/R) LPC Interface Controller (rev 02)

    My work system:
    00:00.0 Host bridge: Intel Corporation 82975X Memory Controller Hub
    00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)

    --
    Ville Syrjälä
    syrjala@sci.fi
    http://www.sci.fi/~syrjala/
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