Thanks Stephane. Yes, it would be very helpful if you can guide me how to
apply the workaround.
On Thu, Sep 4, 2014 at 4:44 PM, Stephane Eranian <eran...@googlemail.com>
wrote:
>
>
>
> On Thu, Sep 4, 2014 at 12:34 PM, Bhavishya Goel <bhavishya.g...@gmail.com>
> wrote:
>
>> Hi,
>>
>> I am facing a problem in counting MEM_UOPS_RETIRED event on Ivy Bridge. I
>> am trying to use it with the *task* command and I get following error:
>>
>> $> task -i -e MEM_UOPS_RETIRED:ALL_LOADS ls
>> task: cannot attach event0 MEM_UOPS_RETIRED:ALL_LOADS: Invalid argument.
>>
>> I am facing similar problem for all the events that have dual names in
>> the output of *showevtinfo* and one of them is marked "deprecated":
>> MEM_LOAD_LLC_HIT_RETIRED/MEM_LOAD_UOPS_LLC_HIT_RETIRED,
>> MEM_LOAD_RETIRED/MEM_LOAD_UOPS_RETIRED.
>> I have tried using both deprecated and recommended names.
>>
>> What am I doing wrong?
>>
>> Nothing wrong.
>
> It is just that those events are broken on IvyBridge. The kernel decided
> to blacklist them to prevent returning
> potentially bogus counts. Event 0xd0, 0xd1, 0xd2 are broken on Sandy
> Bridge, IvyBridge, Haswell. But the
> kernel only blacklisted them on IvyBridge.
>
> The bug is present only when you have Hyperthreading enabled. If you
> measure event 0xd0 in counter 0
> on HT0 then it corrupts whatever event is measured in counter0 HT1.
>
> We posted a kernel workaround to the Linux kernel mailing a couple of
> months back. It is not into mainline
> yet.
>
> I can help you workaround the problem is you are willing to rebuild your
> own kernel.
>
>
>
>
>> Regards
>> Bhavi
>>
>> --
>> ಠ_ಠ
>>
>>
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>>
>
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