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

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Message-ID: <875ycduj21.ffs@tglx>
Date:   Wed, 08 Feb 2023 00:55:50 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Arjan van de Ven <arjan@...ux.intel.com>,
        Usama Arif <usama.arif@...edance.com>, dwmw2@...radead.org
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
Subject: Re: [PATCH v6 11/11] x86/smpboot: reuse timer calibration

Arjan!

On Tue, Feb 07 2023 at 15:16, Arjan van de Ven wrote:
> On 2/2/2023 1:56 PM, 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.
>> 
>> Not-signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
>
> you can turn this in a Signed-off-By:

Please post your patch separately as it is a completely orthogonal issue
and can be reviewed and discussed independently of the parallel bringup
effort.

Thanks,

        tglx