Re: Does Perf support AMD cpu perfectly?

[Chulmin Kim <cmkim@core.kaist.ac.kr>]

Update for this issue.

The patchset works correctly.

Now the problem is the number of the events to be monitored.

I will start a new thread for this issue.

Thanks.



2012-11-26 오후 10:53, Chulmin Kim 쓴 글:
> Sorry for the posting with no patience.
> 
> I've found the patch. (https://patchwork.kernel.org/patch/1722691/)
> 
> It's pretty new. (released on 10,nov,2012)
> 
> If you have something to mention about this issue,
> 
> don't hesitate to contact me.
> 
> Thanks.
> 
> 2012-11-26 오후 10:45, Chulmin Kim 쓴 글:
>> Update for this issue.
>>
>> I'm investigating the kernel source.
>>
>> I found that Perf for AMD seems imperfect in linux 3.0 (my machine's
>> linux version).
>>
>> For AMD family 15h, there is a commented line as follow.
>>    - /* nortbridge counters not yet implemented: */  (line 541,
>> perf_event_amd.c )
>>
>>
>> According to my further exploration, linux 3.2 does not support it either.
>>
>> Does any of you know or have the patch for it?
>>
>>
>> 2012-11-26 오후 9:15, Chulmin Kim 쓴 글:
>>> Update for this issue.
>>>
>>> - rc0 and instruction events show the similar result.
>>> - still, the count of L3 cache miss event is 1/10 of what i expected.
>>> (LLC-load-misses)
>>>
>>>
>>>
>>> 2012-11-26 오후 8:24, Chulmin Kim 쓴 글:
>>>> Hi all.
>>>>
>>>> I'm on the way of monitoring AMD machine.
>>>>
>>>> I wonder Perf is supporting AMD PMU Events perfectly or not.
>>>>
>>>> It seems not working correctly despite the same command works in intel
>>>> machines perfectly.
>>>>
>>>> command : (perf stat -e rc0 -e instructions ./blah)
>>>> result : the value for "rc0" almost equals to that of "instruction" in
>>>> Intel machine, while it does not in AMD machine
>>>>
>>>>
>>>> Other events such as cache events seem weird also.
>>>>
>>>> Is there any material mentioning this issue?
>>>>
>>>>
>>>>
>>>> Thanks!
>>>>
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