From:   Thomas Gleixner <tglx@linutronix.de>
To:     Arjan van de Ven <arjan@linux.intel.com>,
        Usama Arif <usama.arif@bytedance.com>, dwmw2@infradead.org
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
Subject: Re: [PATCH v6 11/11] x86/smpboot: reuse timer calibration
In-Reply-To: <ca89ed9f-3869-9556-0eb3-c5dc84511d95@linux.intel.com>
References: <20230202215625.3248306-1-usama.arif@bytedance.com>
 <20230202215625.3248306-12-usama.arif@bytedance.com>
 <ca89ed9f-3869-9556-0eb3-c5dc84511d95@linux.intel.com>
Date:   Wed, 08 Feb 2023 00:55:50 +0100
Message-ID: <875ycduj21.ffs@tglx>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

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@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.
>> 
>> Not-signed-off-by: Arjan van de Ven <arjan@linux.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