lkml.org 
[lkml]   [2011]   [Apr]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: cpuidle asymmetry (was Re: [RFC PATCH V4 5/5] cpuidle: cpuidle driver for apm)
    > > Moorestown is already an example of an asymmetric system,
    > > since its deepest c-state is available on cpu0, but not on cpu1.
    > > So it needs different tables for each cpu.
    >
    > wtf are these hardware guys smoking and how the heck are we supposed to
    > schedule on such a machine? Prefer to keep cpu1 busy while idling cpu0?

    they are smoking micro-amps:-)

    S0i3 on cpu0 can be entered only after cpu1 is already off-line,
    among other system hardware dependencies...

    So it makes no sense to export S0i3 as a c-state on cpu1.

    When cpu1 is online, the scheduler treats it as a normal SMP.

    cheers,
    -Len Brown, Intel Open Source Technology Center




    \
     
     \ /
      Last update: 2011-04-01 06:11    [W:0.020 / U:62.816 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site