lkml.org 
[lkml]   [2016]   [Jul]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Odd performance results
On Sun, Jul 10, 2016 at 07:43:27AM -0700, Paul E. McKenney wrote:
> On Sun, Jul 10, 2016 at 07:17:19AM +0200, Peter Zijlstra wrote:
> >
> >
> > On 10 July 2016 06:26:39 CEST, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
> > >Hello!
> > >
> > >So I ran a quick benchmark which showed stair-step results. I
> > >immediately
> > >thought "Ah, this is due to CPU 0 and 1, 2 and 3, 4 and 5, and 6 and 7
> > >being threads in a core." Then I thought "Wait, this is an x86!"
> > >Then I dumped out cpu*/topology/thread_siblings_list, getting the
> > >following:
> > >
> > > cpu0/topology/thread_siblings_list: 0-1
> > > cpu1/topology/thread_siblings_list: 0-1
> > > cpu2/topology/thread_siblings_list: 2-3
> > > cpu3/topology/thread_siblings_list: 2-3
> > > cpu4/topology/thread_siblings_list: 4-5
> > > cpu5/topology/thread_siblings_list: 4-5
> > > cpu6/topology/thread_siblings_list: 6-7
> > > cpu7/topology/thread_siblings_list: 6-7
> >
> >
> > I'm guessing this is an AMD bulldozer like machine?
>
> /proc/cpuinfo thinks otherwise:
>
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 6
> model : 60
> model name : Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz

Weird, I've never seen an Intel box do that before... hpa, any idea? or
is this just one weird BIOS.

\
 
 \ /
  Last update: 2016-07-12 17:21    [W:0.063 / U:0.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site