> I don't think it buys you much. People read too much into what
> PEBS gives you. I can show you examples where PEBS
> is worse than no PEBS.
Nothing is perfect in sampling, but the precise instructions event
is definitely better in a range of situations. It avoids
a lot of shadow effects.
I thi
On Wed, Feb 20, 2013 at 12:55:59PM -0800, Andi Kleen wrote:
> Jiri Olsa writes:
>
> > Changing the default 'instructions' HW event for SandyBridge and
> > IvyBrige to use the available precise 'instructions' event.
> >
> > The precise event is defined in Intel SDM as:
> >
> > INST_RETIRED.ALL - P
On Wed, Feb 20, 2013 at 10:01:20PM +0100, Stephane Eranian wrote:
> On Wed, Feb 20, 2013 at 9:55 PM, Andi Kleen wrote:
> > Jiri Olsa writes:
> >
> >> Changing the default 'instructions' HW event for SandyBridge and
> >> IvyBrige to use the available precise 'instructions' event.
> >>
> >> The pre
On Wed, Feb 20, 2013 at 9:55 PM, Andi Kleen wrote:
> Jiri Olsa writes:
>
>> Changing the default 'instructions' HW event for SandyBridge and
>> IvyBrige to use the available precise 'instructions' event.
>>
>> The precise event is defined in Intel SDM as:
>>
>> INST_RETIRED.ALL - Precise instruct
Jiri Olsa writes:
> Changing the default 'instructions' HW event for SandyBridge and
> IvyBrige to use the available precise 'instructions' event.
>
> The precise event is defined in Intel SDM as:
>
> INST_RETIRED.ALL - Precise instruction retired event with HW to
> reduce effect of PEBS shadow i
Changing the default 'instructions' HW event for SandyBridge and
IvyBrige to use the available precise 'instructions' event.
The precise event is defined in Intel SDM as:
INST_RETIRED.ALL - Precise instruction retired event with HW to
reduce effect of PEBS shadow in IP distribution
for both Sand
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