Re: LLC-* events not working on sandybridge

[Namhyung Kim <namhyung.kim@lge.com>]

Hi,

On Sun, 29 Apr 2012 00:03:14 +0100, David Wragg wrote:
> Hi,
>
> I've run into a problem with perf on an Intel Sandybridge machine: The
> LLC-* events never seem to trigger.
>
> For example:
>
> $ perf stat -e LLC-load-misses ls /
> [...]
>                  0 LLC-load-misses
>
>        0.001082639 seconds time elapsed
>
> Non-LLC events work fine:
>
> $ perf stat -e cache-misses ls /
> [...]
>              4,272 cache-misses
>
>        0.002945606 seconds time elapsed
>
> This is on a Intel i5 machine (i5-2520M), running a fully updated Fedora
> 16 ('perf --version': 3.3.2-6.fc16.x86_64, 'uname -r':
> 3.3.2-6.fc16.x86_64).
>
> Any ideas?
>
> David

I have a same problem on my i7-3930K machine. I guess it's because of
lacking of extra register (MSP_OFFCORE_RSP_X) settings. But I have no
idea of how I can set it properly :(.

Thanks,
Namhyung