Messages in this thread | | | Date | Tue, 9 Dec 2008 12:22:25 +0100 | From | Ingo Molnar <> | Subject | Re: [patch] Performance Counters for Linux, v2 |
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* David Miller <davem@davemloft.net> wrote:
> From: Ingo Molnar <mingo@elte.hu> > Date: Tue, 9 Dec 2008 12:02:46 +0100 > > > > > * stephane eranian <eranian@googlemail.com> wrote: > > > > > > There's also more generic x86 support: all 4 generic PMCs of Nehalem > > > > / Core i7 are supported - i've run 4 instances of KernelTop and they > > > > used up four separate PMCs. > > > > > > Core/Atom have 5 counters, Nehalem has 7. Why are you not using all of > > > them already? > > > > no, Nehalem has 4 generic purpose PMCs and 3 fixed-purpose PMCs (7 > > total), > ... > > Saying that it has 7 is misleading. > > Even you just did.
which portion of my point stressing the general purpose attribute was unclear to you?
Saying it has 7 is misleading in the same way as if i told you now: "look, i have four eyes!". (they are: left eye looking right, left eye looking left, right eye looking left and right eye looking right)
Nehalem has 4 general purpose PMCs, not 7. Yes, it has 7 counters but they are not all general purpose. The P4 has 18.
Ingo
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