linux-kernel - Re: [RFC PATCH] x86/CPU/AMD: Bring back Compute Unit ID

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Date:   Thu, 2 Feb 2017 16:43:59 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Ghannam, Yazen" <Yazen.Ghannam@....com>
Cc:     x86-ml <x86@...nel.org>, Yves Dionne <yves.dionne@...il.com>,
        Brice Goglin <Brice.Goglin@...ia.fr>,
        Peter Zijlstra <peterz@...radead.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] x86/CPU/AMD: Bring back Compute Unit ID

On Thu, Feb 02, 2017 at 01:10:54PM +0100, Borislav Petkov wrote:
> Now on to run the same thing on a bigger bulldozer.

It looks differently on the bigger box:

before:

 Performance counter stats for 'make -s -j17 bzImage' (3 runs):

    1333240.579196      task-clock (msec)         #    9.271 CPUs utilized            ( +-  0.03% )
           393,521      context-switches          #    0.295 K/sec                    ( +-  0.27% )
     6,629,632,543      cache-misses                                                  ( +-  0.10% )
            51,570      cpu-migrations            #    0.039 K/sec                    ( +-  1.21% )
        27,812,379      page-faults               #    0.021 M/sec                    ( +-  0.05% )
 3,633,456,270,448      cycles                    #    2.725 GHz                      ( +-  0.03% )
 2,144,192,888,087      instructions              #    0.59  insn per cycle                                              ( +-  0.00% )
   476,225,081,234      branches                  #  357.194 M/sec                    ( +-  0.00% )
    25,294,199,758      branch-misses             #    5.31% of all branches          ( +-  0.02% )

     143.807894000 seconds time elapsed                                          ( +-  0.89% )


after:

 Performance counter stats for 'make -s -j17 bzImage' (3 runs):

    1330842.218684      task-clock (msec)         #    9.047 CPUs utilized            ( +-  0.14% )
           396,044      context-switches          #    0.298 K/sec                    ( +-  0.60% )
     6,625,112,597      cache-misses                                                  ( +-  0.36% )
            60,050      cpu-migrations            #    0.045 K/sec                    ( +-  1.11% )
        27,862,451      page-faults               #    0.021 M/sec                    ( +-  0.08% )
 3,625,822,644,429      cycles                    #    2.724 GHz                      ( +-  0.12% )
 2,144,932,865,362      instructions              #    0.59  insn per cycle                                              ( +-  0.01% )
   476,375,898,692      branches                  #  357.951 M/sec                    ( +-  0.01% )
    25,226,837,830      branch-misses             #    5.30% of all branches          ( +-  0.09% )

     147.109189694 seconds time elapsed                                          ( +-  0.49% )

-- 
Regards/Gruss,
    Boris.

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