From:   Thomas Gleixner <tglx@linutronix.de>
To:     Usama Arif <usama.arif@bytedance.com>, dwmw2@infradead.org,
        arjan@linux.intel.com
Cc:     mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
        hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com,
        paulmck@kernel.org, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, rcu@vger.kernel.org, mimoja@mimoja.de,
        hewenliang4@huawei.com, thomas.lendacky@amd.com, seanjc@google.com,
        pmenzel@molgen.mpg.de, fam.zheng@bytedance.com,
        punit.agrawal@bytedance.com, simon.evans@bytedance.com,
        liangma@liangbit.com, Usama Arif <usama.arif@bytedance.com>
Subject: Re: [PATCH v6 11/11] x86/smpboot: reuse timer calibration
In-Reply-To: <20230202215625.3248306-12-usama.arif@bytedance.com>
References: <20230202215625.3248306-1-usama.arif@bytedance.com>
 <20230202215625.3248306-12-usama.arif@bytedance.com>
Date:   Tue, 07 Feb 2023 01:31:43 +0100
Message-ID: <87k00uwc28.ffs@tglx>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

On Thu, Feb 02 2023 at 21:56, Usama Arif wrote:
> From: Arjan van de Ven <arjan@linux.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@linux.intel.com>

Thanks,

        tglx