linux-kernel - Re: [PATCH v6 11/11] x86/smpboot: reuse timer calibration

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Message-ID: <87k00uwc28.ffs@tglx>
Date:   Tue, 07 Feb 2023 01:31:43 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Usama Arif <usama.arif@...edance.com>, dwmw2@...radead.org,
        arjan@...ux.intel.com
Cc:     mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, x86@...nel.org, pbonzini@...hat.com,
        paulmck@...nel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, rcu@...r.kernel.org, mimoja@...oja.de,
        hewenliang4@...wei.com, thomas.lendacky@....com, seanjc@...gle.com,
        pmenzel@...gen.mpg.de, fam.zheng@...edance.com,
        punit.agrawal@...edance.com, simon.evans@...edance.com,
        liangma@...ngbit.com, Usama Arif <usama.arif@...edance.com>
Subject: Re: [PATCH v6 11/11] x86/smpboot: reuse timer calibration

On Thu, Feb 02 2023 at 21:56, Usama Arif wrote:
> From: Arjan van de Ven <arjan@...ux.intel.com>
>
> No point recalibrating for known-constant tsc.
> When tested on a 128 core, 2 socket server, this reduces
> the parallel smpboot time from 100ms to 30ms.

This is completely independent of the parallel bringup, so this should
have a proper SOB and be at the beginning of this series for a long
time.

> Not-signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>

Thanks,

        tglx