lkml.org 
[lkml]   [2013]   [Nov]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [GIT PULL] core kernel update
    On Tue, Nov 19, 2013 at 08:09:04PM +0100, Ingo Molnar wrote:
    > The actual value of the limit - here's the on-stack cpumask sizes of
    > the candidate range:
    >
    > 128 CPUs: 16 byte cpumasks
    > 256 CPUs: 32 byte cpumasks
    > 512 CPUs: 64 byte cpumasks

    So 512 / 64bytes is a single cacheline and feels like a nice cut-off
    before requiring an extra indirection and more cachelines.

    64 bytes also doesn't sound _that_ big to have on-stack.

    So I'd go for having the cut-off on >512, unless of course theres
    evidence 64bytes is already too much.


    \
     
     \ /
      Last update: 2013-11-19 20:41    [W:3.030 / U:0.572 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site