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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