Messages in this thread | | | Date | Wed, 23 Aug 2006 05:58:43 -0700 | From | Stephane Eranian <> | Subject | Re: [PATCH 18/18] 2.6.17.9 perfmon2 patch for review: new x86_64 files |
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Andi,
On Wed, Aug 23, 2006 at 02:29:04PM +0200, Andi Kleen wrote: > On Wednesday 23 August 2006 14:14, Stephane Eranian wrote: > > > On Wed, Aug 23, 2006 at 01:22:44PM +0200, Andi Kleen wrote: > > > > > > > I have a second thought on this. AMD has architected the performance counters. > > > > > > Quote: > > > >> > > > Implementations are not required to support the performance > > > c o u n t e rs and the event-select registers, or the time-stamp > > > counter. The presence of these features can be determined by > > > << > > > > > At the end of this paragraph then mention using CPUID to determine > > the presence of the counters. AFAIK, there is no feature bit > > covering performance monitoring. Does that mean we are left > > with having to check the family and model number just like on > > Intel? > > Yes I puzzled over that too. Maybe they meant the MSR CPUID bits, but most likely > it was a mistake by the tech writer. > > Yes I think you have to. Only checking vendor/family should be fine though -- i am not > aware of performance counter variations between models.
Today, I am just checking for family 15. If they have variations it could be with the low power (laptop) models where counters may not be present at all.
> Perhaps add a force argument again that disables the family check too. > > > Ok, I think I understand now: > > 1/ Bios and Kernel Developer Guide from Ahtlon64 and Opteron 64 is > > what you are talking about with K7/K8 > > Well K8. > > K7 has a different one. But ok. I think you don't try to support K7 at all > currently (it has the same register format as K8, but the list of counters > is different) > What is the "commercial name" of K7 processors?
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