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    SubjectRe: [RFT] Port 0x80 I/O speed
    Date
    On Wednesday 12 December 2007 00:31:18 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.
    >
    > Posted a previous incarnation of this before, buried in the outb 0x80
    > thread which had a serialising problem. This one should as far as I can see
    > measure the right thing though. Please yell if you disagree...
    >
    > For me, on a Duron 1300 (AMD756 chipset) I have a constant:
    >
    > rene@7ixe4:~/src/port80$ su -c ./port80
    > cycles: out 2400, in 2400
    >
    > and on a PII 400 (Intel 440BX chipset) a constant:
    >
    > rene@6bap:~/src/port80$ su -c ./port80
    > cycles: out 553, in 251
    >
    > Results are (mostly) independent of compiler optimisation, but testing with
    > an -O2 compile should be most useful. Thanks!
    >
    > Rene.

    Cyrix MII PR300 (225MHz), i430TX: cycles: out 263, in 93
    Pentium MMX 166MHz @133MHz, VIA VPX: cycles: out 163, in 163
    Celeron 433MHz, i440BX: cycles: out 620, in 305
    Celeron 1.3GHz, i440BX: cycles: out 2114, in 849
    Celeron 1.7GHz (P4-based), i845: cycles: out 2178, in 1651
    Pentium 4 3.2GHz, i925X: cycles: out 2824, in 1899
    Xeon E5310 1.6GHz, Dell PE1950 cycles: out 2631, in 1606
    Xeon 3050 2.13GHz, Dell PE860 cycles: out 3367, in 1959

    --
    Ondrej Zary


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