By the way, I have similar problems with PERF_COUNT_HW_CACHE_L1D event.
Will the kernel workaround fix this event too?
On Thu, Sep 4, 2014 at 5:12 PM, Bhavishya Goel <bhavishya.g...@gmail.com>
wrote:
> 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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