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    SubjectRe: [RFT] Port 0x80 I/O speed
    On Wed, 12 Dec 2007 00:31:18 +0100
    Rene Herman <rene.herman@gmail.com> wrote:
    >
    > 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!
    >

    ### Core2 Duo 1.8 GHz ###

    X86_64 -m32 -O2:

    $ for i in `seq 5`; do sudo ./port80; sleep 1; done
    cycles: out 1498, in 964
    cycles: out 1498, in 964
    cycles: out 1499, in 964
    cycles: out 1498, in 964
    cycles: out 1498, in 965

    processor : 0
    vendor_id : GenuineIntel
    cpu family : 6
    model : 15
    model name : Intel(R) Core(TM)2 CPU 6300 @ 1.86GHz
    stepping : 6
    cpu MHz : 1864.805
    cache size : 2048 KB
    physical id : 0
    siblings : 2
    core id : 0
    cpu cores : 2
    fpu : yes
    fpu_exception : yes
    cpuid level : 10
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm
    bogomips : 3731.82
    clflush size : 64
    cache_alignment : 64
    address sizes : 36 bits physical, 48 bits virtual
    power management:

    [...]


    --
    Paolo Ornati
    Linux 2.6.24-rc4-g94545bad on x86_64


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