Re: [PATCH] perf, x86: Add Nehelem PMU programming errata workaround

[Andi Kleen]

Peter Zijlstra <peterz@xxxxxxxxxxxxx> writes:

> Subject: perf, x86: Add Nehelem PMU programming errata workaround
> From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> Date: Fri Mar 26 13:59:41 CET 2010
>
> Implement the workaround for Intel Errata AAK100 and AAP53.
>
> Also, remove the Core-i7 name for Nehalem events since there are also
> Westmere based i7 chips.

Did you actually see this happen?

It looks like this will make the context switch into a perf
enabled process _MUCH_ more expensive, MSR writes are very slow.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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