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    SubjectRe: [PATCH 7/7] ondemand: Solve the big performance issue with ondemand during disk IO
    Hi!

    > > Well, and now, if you do something like cat /dev/<your usb1.1 hdd> >
    > > /dev/null, you'll keep cpu on max frequency. Not a problem for new
    > > core i7, but probably big deal for athlon 64.
    >
    > do you have facts not speculation for this? Does the athlon 64 really
    > keep its voltage high during idle? That would surprise me greatly...

    So... some old data. It is not exactly athlon 64 -- I don't have that
    particular number for it -- but: (from my old notes):

    evo n620c [63.3 Wh]
    ~~~~~~~~~~~~~~~~~
    idle machine at 1.7GHz, min bl: 13.0 W
    idle machine at 600MHz, min bl: 12.0 W
    thinkpad x32 [52Wh]
    ~~~~~~~~~~~~
    idle machine at 600MHz, min bl: 10 W
    at 1.8GHz: +6.6 W
    hp nx5k [56.8Wh]
    ~~~~~~~
    idle, min bl: 19 W
    min bl, 1.4GHz: 22 W
    ...so yes, I kind of see a pattern there. And you should be able to
    easily see the difference, too, if you took something from that era...

    Pavel
    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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