Received: by 2002:a05:6a10:a841:0:0:0:0 with SMTP id d1csp579290pxy;
        Thu, 22 Apr 2021 08:39:53 -0700 (PDT)
X-Google-Smtp-Source: ABdhPJw0UGRCav9ggFugG0qvrA2H0H7JO7a69YOvUFchdMmVlpnOoLqV1RKHdBV5A8LItVk8lnrC
X-Received: by 2002:a63:a847:: with SMTP id i7mr4107825pgp.203.1619105992909;
        Thu, 22 Apr 2021 08:39:52 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1619105992; cv=none;
        d=google.com; s=arc-20160816;
        b=h5tzEpCFyLsNkqv/pD/NHhrECGUhvW7QYQJE/yso8RhUoMz4R63nbi3TrNsUILVNtA
         YCtbOcOkS1wJkxImBEg+vwA9r2Ur3WsU8ZRlNIXDV6R9sMFsRdU5/Eu5Gmn0A/lBQ0+B
         A8EqAAlEV0kkGLcwcbVhT66hDLb65a6clW6oeBirMEJAGktHbJGSi7TNqGEYOc0VUH+k
         vzL1r7+aaEkzxHCbWN5OnUL21n1+fpvKZyyEB3LcHyIEfNIi1vbuRN2XV6+XgUNlmGij
         wjZcwsxkNvhAzjtv9sK4NdCt6LiFjJhznDCA5182z3y96bydHATLvYGDLxhb+CRLLhYT
         VXuQ==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=list-id:precedence:mime-version:message-id:date:references
         :in-reply-to:subject:cc:to:dkim-signature:dkim-signature:from;
        bh=7qWCJ3Q81wcbF9una1Suq0iJg1VmWt6VflPj/doKZ1I=;
        b=DzkbBKDWiW9VtIwVm4qPV+judCTl3LpID8JYQl5I0iJUlncdlyT0RoGixW4oxutf6P
         YH/wGqf+WT7DuFxwvBgvkQanvwKp/DVZeQtgb6ecBFZnAagCKVX9UkZokeoV3mjhAsKV
         d2UM7idIaNyX2lPTI7VnBUvp1s0kosxqRX330WOMalm2tuQ9PeTq/QGk7aK7k7iyW2b2
         qaAKTIGhBxW5RN6xVEDzfAEClmDqIect9pBuOyRCbjHYVvcLy40RSLEPspMLAjxAffAR
         XUy4odKfC1X2X3NRmNSzcy9VOo8/6vgeTzb55MpKlKTNxDqWJrDIroMmkpWDOuboaPE0
         N7Yg==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=pass header.i=@linutronix.de header.s=2020 header.b=N25SkA3k;
       dkim=neutral (no key) header.i=@linutronix.de header.s=2020e header.b=qwgquP63;
       spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org;
       dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18])
        by mx.google.com with ESMTP id 13si3614462pll.345.2021.04.22.08.39.40;
        Thu, 22 Apr 2021 08:39:52 -0700 (PDT)
Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Authentication-Results: mx.google.com;
       dkim=pass header.i=@linutronix.de header.s=2020 header.b=N25SkA3k;
       dkim=neutral (no key) header.i=@linutronix.de header.s=2020e header.b=qwgquP63;
       spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org;
       dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S236589AbhDVPhz (ORCPT <rfc822;liuhaibinniu@gmail.com>
        + 99 others); Thu, 22 Apr 2021 11:37:55 -0400
Received: from Galois.linutronix.de ([193.142.43.55]:39252 "EHLO
        galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S236396AbhDVPhy (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Thu, 22 Apr 2021 11:37:54 -0400
From:   Thomas Gleixner <tglx@linutronix.de>
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de;
        s=2020; t=1619105838;
        h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
         to:to:cc:cc:mime-version:mime-version:content-type:content-type:
         in-reply-to:in-reply-to:references:references;
        bh=7qWCJ3Q81wcbF9una1Suq0iJg1VmWt6VflPj/doKZ1I=;
        b=N25SkA3kl4XpGp2xguAdMeXSnlVNgloS5PA1DfRFITGe3mWyz6pMSrTB012J81QQpeEdE/
        GLYjR2p1Ws2H/1Q9WUkTyvyNjuYEcWXucWDiQIQVVQYFoRMZuKpSy2iURXZBLFcaROY0c/
        vzZWMgVWn0WRLcywNaNP/8dF/hkrP1bA7HVA2vFTvyf6Q49qCwb8VTGgB77wtOwhBWW2xV
        QMkxX4b88wWRsnXwPr76umysqB4HQ/c+Z0sAH4MPCr1dRTGQRHB6vTo4iMTr7ZnC8GMJEP
        s+iBN6bpw3g5iCBP6arLTVXPVoXeNnPNToforZWRBJEGK6VFuZynhSUxcTuBLA==
DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de;
        s=2020e; t=1619105838;
        h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
         to:to:cc:cc:mime-version:mime-version:content-type:content-type:
         in-reply-to:in-reply-to:references:references;
        bh=7qWCJ3Q81wcbF9una1Suq0iJg1VmWt6VflPj/doKZ1I=;
        b=qwgquP63myVNvjX12jgtSjHCEboVKD9vtmrZbWxL0TX7LLQUFRGh5lxqaNeO8Fi1IfjpkO
        0IP/8UN/uRRGB0AQ==
To:     Oliver Sang <oliver.sang@intel.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Oleg Nesterov <oleg@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>, x86@kernel.org,
        lkp@lists.01.org, lkp@intel.com, ying.huang@intel.com,
        feng.tang@intel.com, zhengjun.xing@intel.com
Subject: Re: [signal]  4bad58ebc8:  will-it-scale.per_thread_ops -3.3% regression
In-Reply-To: <20210422060213.GC31382@xsang-OptiPlex-9020>
References: <20210420030837.GB31773@xsang-OptiPlex-9020> <87bla8rehx.ffs@nanos.tec.linutronix.de> <20210422060213.GC31382@xsang-OptiPlex-9020>
Date:   Thu, 22 Apr 2021 17:37:18 +0200
Message-ID: <87eef2xrdd.ffs@nanos.tec.linutronix.de>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Oliver,

On Thu, Apr 22 2021 at 14:02, Oliver Sang wrote:
> On Tue, Apr 20, 2021 at 08:35:06PM +0200, Thomas Gleixner wrote:
>> Confused.
>
> FYI.
> we re-test this, and confirmed the regression persistent. still:
>
> 69995ebbb9d37173 4bad58ebc8bc4f20d89cff95417
> ---------------- ---------------------------
>          %stddev     %change         %stddev
>              \          |                \
>  1.271e+09            -3.3%  1.229e+09        will-it-scale.192.threads
>    6620228            -3.3%    6401749        will-it-scale.per_thread_ops
>  1.271e+09            -3.3%  1.229e+09        will-it-scale.workload

I'll have a look.