Hey Peter,
Why is PEBS disabled? If I look at the intel_clovertown_quirks I can see
why it's disabled for that cpu, but the sandy bridge one lacks any kind
of clarification or information on why, or how I can learn more.
Cheers,
Maarten
On Fri, 2012-02-17 at 13:39 +0100, Maarten Lankhorst wrote:
> Hey Peter,
>
> Why is PEBS disabled? If I look at the intel_clovertown_quirks I can see
> why it's disabled for that cpu, but the sandy bridge one lacks any kind
> of clarification or information on why, or how I can learn more.
hpa, could you get the official Intel answer on this?
On 02/17/2012 07:12 AM, Peter Zijlstra wrote:
> On Fri, 2012-02-17 at 13:39 +0100, Maarten Lankhorst wrote:
>> Hey Peter,
>>
>> Why is PEBS disabled? If I look at the intel_clovertown_quirks I can see
>> why it's disabled for that cpu, but the sandy bridge one lacks any kind
>> of clarification or information on why, or how I can learn more.
>
> hpa, could you get the official Intel answer on this?
*Where* is PEBS disabled?
-hpa
On 2/17/12 2:40 PM, H. Peter Anvin wrote:
> On 02/17/2012 07:12 AM, Peter Zijlstra wrote:
>> On Fri, 2012-02-17 at 13:39 +0100, Maarten Lankhorst wrote:
>>> Hey Peter,
>>>
>>> Why is PEBS disabled? If I look at the intel_clovertown_quirks I can see
>>> why it's disabled for that cpu, but the sandy bridge one lacks any kind
>>> of clarification or information on why, or how I can learn more.
>>
>> hpa, could you get the official Intel answer on this?
>
> *Where* is PEBS disabled?
arch/x86/kernel/cpu/perf_event_intel.c,
intel_sandybridge_quirk()
David
On 02/17/2012 02:08 PM, David Ahern wrote:
> On 2/17/12 2:40 PM, H. Peter Anvin wrote:
>> On 02/17/2012 07:12 AM, Peter Zijlstra wrote:
>>> On Fri, 2012-02-17 at 13:39 +0100, Maarten Lankhorst wrote:
>>>> Hey Peter,
>>>>
>>>> Why is PEBS disabled? If I look at the intel_clovertown_quirks I can
>>>> see
>>>> why it's disabled for that cpu, but the sandy bridge one lacks any kind
>>>> of clarification or information on why, or how I can learn more.
>>>
>>> hpa, could you get the official Intel answer on this?
>>
>> *Where* is PEBS disabled?
>
> arch/x86/kernel/cpu/perf_event_intel.c,
> intel_sandybridge_quirk()
>
OK, this is Peter's patch and I don't think I was involved with it... I
need more of a pointer to be able to track this down.
-hpa