linux-kernel - RE: [PATCH v3 3/3] x86/tsc_msr: Make MSR derived TSC frequency more accurate

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Message-ID: <7486ebeb98bd44d4a50fb6f2df4799df@AcuMS.aculab.com>
Date:   Mon, 10 Feb 2020 10:08:38 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Andy Shevchenko' <andy.shevchenko@...il.com>,
        Hans de Goede <hdegoede@...hat.com>
CC:     Andy Shevchenko <andy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Vipul Kumar <vipulk0511@...il.com>,
        Vipul Kumar <vipul_kumar@...tor.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Srikanth Krishnakar <Srikanth_Krishnakar@...tor.com>,
        Cedric Hombourger <Cedric_Hombourger@...tor.com>,
        Len Brown <len.brown@...el.com>,
        Rahul Tanwar <rahul.tanwar@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        "Gayatri Kammela" <gayatri.kammela@...el.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Stable <stable@...r.kernel.org>
Subject: RE: [PATCH v3 3/3] x86/tsc_msr: Make MSR derived TSC frequency more
 accurate

From: Andy Shevchenko
> Sent: 07 February 2020 22:12
> On Fri, Feb 7, 2020 at 10:55 PM Hans de Goede <hdegoede@...hat.com> wrote:
> >
> > The "Intel 64 and IA-32 Architectures Software Developer’s Manual
> > Volume 4: Model-Specific Registers" has the following table for the
> > values from freq_desc_byt:
> 
> For the LGM people in Cc list. Hans included you in order to confirm
> what's going on with TSC on LGM SoC.
> Can you do it in a way that we certainly know clocks with good
> precision (and if Spread Spectrum is in use what should we put here)?

Isn't 'Spread Spectrum' just a scam so that the resonant detector
used by the test equipment fails to register anything?

	David

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