Re: Does Perf support AMD cpu perfectly?

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

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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