lkml.org 
[lkml]   [2008]   [Mar]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: P6 NOPs again: MPSC?
    Hugh Dickins wrote:
    > I've now noticed that the machine I call MPENTIUM4 for 32-bit kernels
    > is called MPSC for 64-bit kernels, and in that case it still doesn't
    > get the P6 NOPs which I'm guessing it ought to (yeah, I'm so excited
    > about the speedup I can expect from P6 NOPs, can we perhaps have a
    > little silvery "Using Genuine P6 NOPs" sticker to put on the box? ;)
    >
    > I'm suspecting that the patch below is actually wrong, and that it's
    > really the "(X86_64 || !X86_GENERIC) &&" which should be changed;
    > but very unsure of my ground and what's right for CPU_GENERIC -
    > the 32/64 heritage of x86/Kconfig.cpu rather confuses me.
    >
    > Over to you to do the right thing, I'm hoping, please, Peter!
    >

    X86_64 && !X86_GENERIC comes from not wanting to be a compatibility
    issue when compiling for generic CPUs. There are some 32-bit otherwise
    i686-compatible chips (from VIA and Transmeta) which don't have these NOPs.

    -hpa



    \
     
     \ /
      Last update: 2008-03-10 21:31    [W:0.019 / U:120.932 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site