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    SubjectRe: [RFT] Port 0x80 I/O speed
    Date
    On Wednesday 12 December 2007 01:44:42 Rene Herman wrote:
    > On 12-12-07 00:40, Maxim Levitsky wrote:
    >
    > > maxim@MAIN:~/tmp$ sudo ./port800
    > > cycles: out 1767, in 1147
    > > maxim@MAIN:~/tmp$ sudo ./port800
    > > cycles: out 1774, in 1148
    > > maxim@MAIN:~/tmp$ sudo ./port800
    > > cycles: out 1769, in 1150
    > > maxim@MAIN:~/tmp$ sudo ./port800
    > > cycles: out 1769, in 1150
    > > maxim@MAIN:~/tmp$ sudo ./port800
    > > cycles: out 1777, in 1150
    > > maxim@MAIN:~/tmp$ sudo ./port800
    > > cycles: out 1766, in 1149
    > > maxim@MAIN:~/tmp$ sudo ./port800
    > > cycles: out 1768, in 1148
    > > maxim@MAIN:~/tmp$ sudo ./port800
    > > cycles: out 1765, in 1147
    > >
    > >
    > > Core 2 Duo system (ICH8/Intel DG965RY motherboard)
    >
    > 1.8 Ghz?
    >
    > Rene.
    >
    >

    2.1 GHZ. but usually reduced by EIST to 1.5 GHz
    (It can have just two values above)

    I did the tests again:


    CPU frequency locked to 2128.000 Mhz:
    maxim@MAIN:~/tmp$ sudo ./port800
    cycles: out 1650, in 1065
    maxim@MAIN:~/tmp$ sudo ./port800
    cycles: out 1648, in 1066
    maxim@MAIN:~/tmp$ sudo ./port800
    cycles: out 1649, in 1065
    maxim@MAIN:~/tmp$ sudo ./port800
    cycles: out 1648, in 1065
    maxim@MAIN:~/tmp$


    CPU frequency locked to: 1596.000 Mhz
    maxim@MAIN:~/tmp$ sudo ./port800
    cycles: out 1730, in 1138
    maxim@MAIN:~/tmp$ sudo ./port800
    cycles: out 1730, in 1138
    maxim@MAIN:~/tmp$ sudo ./port800
    cycles: out 1735, in 1140
    maxim@MAIN:~/tmp$ sudo ./port800
    cycles: out 1734, in 1139
    maxim@MAIN:~/tmp$ sudo ./port800
    cycles: out 1734, in 1138
    maxim@MAIN:~/tmp$ 2128.000


    A bit strange, isn't it?
    Regards,
    Maxim Levitsky


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