[lkml]   [2004]   [Jan]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: Laptops & CPU frequency
    > > > I have an athlon-xp laptop (HP pavilion ze4500) with powernow that
    > > > definitely goes into low power mode when the plug is pulled. The screen
    > > > goes dark, and everything slows down.
    > >
    > > Dave did not mean that the other power management schemes cannot do the
    > > automatic reduction on loss of AC, just that there is no SMM/BIOS hacks
    > > to do it automatically.
    > People are designing machines where battery can't provide
    > enough ampers for cpu in high-power mode. If speedstep machines
    > have same problem, SMM is actually right thing to do.

    This reminds me of an idea I had years ago, but never really looked in
    to very much, (it may well have been implemented somewhere
    independently of my idea anyway). Basically, it was for a multi-cpu
    machine which, instead of running cpus in parallel, with all the
    common scaling problems, ran each CPU in series for a very short
    timeslice, effectively being a uni-processor machine, but moving the
    state of the processor's registers between physical CPUs. The theory
    was that it would be possible to clock each CPU much higher for a
    short period of time than it could be successfully clocked
    continuously. Physical CPUs with poor cooling could even be given a
    shorter timeslice.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 14:00    [W:0.019 / U:26.476 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site