Re: [PATCH] Do not modify MSR_IA32_ENERGY_PERF_BIAS in kernel

Len Brown
2016-03-08T00:50:59Z

> But with Broadwell-EP processor (E5-2687W v4) the CPU will not enter turbo modes
> if this value is not set to performance

BDX-EP supports HWP.
Are these failing machines running in HWP mode?

(On BDX-EP, and only on BDX-EP, EPB acts to set the BIAS for HWP,
because that processor doesn't yet have EPP.)

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Len Brown, Intel Open Source Technology Center