Re: [PATCH v2 14/16] perf tools: add new mem command for memoryaccess profiling

From: Arnaldo Carvalho de Melo
Date: Tue Nov 06 2012 - 12:05:10 EST


Em Tue, Nov 06, 2012 at 01:51:19PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Nov 06, 2012 at 04:49:26PM +0100, Stephane Eranian escreveu:
> > On Tue, Nov 6, 2012 at 4:44 PM, Arnaldo Carvalho de Melo
> > <acme@xxxxxxxxxx> wrote:
> > > Em Mon, Nov 05, 2012 at 02:51:01PM +0100, Stephane Eranian escreveu:
> > >> + sprintf(event, "cpu/mem-loads/pp");

> > > Fails for me on a Sandy Bridge notebook:

> > That's because you need to update the microcode.
>
> > $ sudo modprobe microcode
> > $ cat /proc/cpuinfo

> > Line with microcode needs to say:
> > microcode : 0x28

> Here it says:

> microcode : 0x25

Updated it and now I have 0x28, better:

Samples: 8K of event 'cpu/mem-loads/pp', Event count (approx.): 89255
0.75% 1 665 L3 hit [.] arena_run_tree_remove
0.67% 1 602 LFB hit [.] nsSMILAnimationController::DoSample(bool)
0.63% 1 563 Local RAM hit [.] 0x00000000004620c4
0.58% 1 515 Local RAM hit [.] 0x00007f6b278aa7bc
0.54% 1 479 L2 hit [.] XPending
0.33% 1 292 Local RAM hit [.] nsSVGFEMorphologyElement::Filter(nsSVGFilterInstance*, nsTArray<

Will do more tests after lunch,

- Arnaldo
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