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Date:   Fri, 1 May 2020 17:04:23 -0700
From:   Ricardo Neri <>
To:     Giovanni Gherdovich <>
Cc:     Srinivas Pandruvada <>,
        Thomas Gleixner <>,
        Ingo Molnar <>,
        Peter Zijlstra <>,
        Borislav Petkov <>, Len Brown <>,
        "Rafael J . Wysocki" <>,,,,
        Linus Torvalds <>
Subject: Re: [PATCH 2/2] x86, sched: Bail out of frequency invariance if
 turbo frequency is unknown

On Tue, Apr 28, 2020 at 03:24:50PM +0200, Giovanni Gherdovich wrote:
> There may be CPUs that support turbo boost but don't declare any turbo
> ratio, i.e. their MSR_TURBO_RATIO_LIMIT is all zeroes. In that condition
> scale-invariant calculations can't be performed.
> Signed-off-by: Giovanni Gherdovich <>
> Suggested-by: Ricardo Neri <>

Thanks for implementing this, Giovanni!

Tested-by: Ricardo Neri <>

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