lkml.org 
[lkml]   [2009]   [Jan]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [patch] tlb flush_data: replace per_cpu with an array

    * Peter Zijlstra <peterz@infradead.org> wrote:

    > > - char pad[SMP_CACHE_BYTES];
    > > -} ____cacheline_aligned;
    > > + char pad[X86_INTERNODE_CACHE_BYTES];
    > > +} ____cacheline_internodealigned_in_smp;
    >
    > That will make the below array 8*4096 bytes for VSMP, which pushes the
    > limit for memory savings up to 256 cpus.

    VSMP is a clustering solution (default-disabled) that pushes
    L1_CACHE_BYTES to 4096 bytes (4K). That is an extremely large alignment
    that pushes up the BSS size ten-fold (!), so no generic Linux distribution
    enables it. 32K compared to 9MB bloat caused by 4K cachelines is a drop in
    the ocean.

    Ingo


    \
     
     \ /
      Last update: 2009-01-13 13:35    [W:4.134 / U:0.036 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site