Re: unable to get load latency info

[Harald Servat <harald.servat@bsc.es>]

On 03/03/14 06:12, Muthusamy wrote:
>> On 28/02/14 14:42, Andi Kleen wrote:
>
>> I don't think r100b is a valid event on Westmere.
>
> Thanks for the replies.
> As Harald Servat and others pointed I am now trying "perf mem record"
>
> [root@rafa cms]# ./perf mem record /bin/ls
> invalid or unsupported event: 'cpu/mem-loads/pp'
>
> Is this a issue with the (old) kernel version I am on or the CPU version or both.
>
> Regards,
> Muthusamy C

   I'm using

   Linux laptop 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 
2013 x86_64 x86_64 x86_64 GNU/Linux

   so I imagine that you're ok with respect to OS. Now I remember I had 
to install some microcode module for my OS, though [2]. WRT hardware, 
I'm running on top of a

vendor_id	: GenuineIntel
cpu family	: 6
model		: 42
model name	: Intel(R) Core(TM) i7-2760QM CPU @ 2.40GHz
stepping	: 7

    Besides of that, the Intel Manual [1] says in section 18.7.1.1 that 
Nehalem (and I'd would guess Westmere, as it is a Nehalem successor) 
supports PEBS, so it should work.

Best regards.

[1] 
http://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-vol-3b-part-2-manual.pdf
[2] http://packages.ubuntu.com/lucid/intel-microcode

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