Message-ID: <1490879944.4702.52.camel@gmx.de>
Subject: Re: [BUG nohz]: wrong user and system time accounting
From: Mike Galbraith <efault@gmx.de>
To: Frederic Weisbecker <fweisbec@gmail.com>,
        Wanpeng Li <kernellwp@gmail.com>
Cc: Rik van Riel <riel@redhat.com>,
        Luiz Capitulino <lcapitulino@redhat.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Date: Thu, 30 Mar 2017 15:19:04 +0200
In-Reply-To: <20170330124026.GA3626@lerouge>
References: <20170323165512.60945ac6@redhat.com>
         <CANRm+CxcgSP2-x+A822DmHLvFLzFmTptS6oYwYtwVdErTpiB=Q@mail.gmail.com>
         <1490636129.8850.76.camel@redhat.com> <20170328132406.7d23579c@redhat.com>
         <20170329131656.1d6cb743@redhat.com> <1490818125.28917.11.camel@redhat.com>
         <CANRm+CwfTYJr4FRP5MaLCgc=_21rce9mdXm2UcWYFOU-AdZJNw@mail.gmail.com>
         <20170330124026.GA3626@lerouge>
Content-Type: text/plain; charset="UTF-8"
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 627
Lines: 15

On Thu, 2017-03-30 at 14:40 +0200, Frederic Weisbecker wrote:
> On Thu, Mar 30, 2017 at 09:58:44AM +0800, Wanpeng Li wrote:

> > There is such a feature skew_tick currently, refer to commit
> > 5307c9556bc (tick: add tick skew boot option), w/ skew_tick=1 boot
> > parameter, the bug disappear, however, the commit also mentioned that
> > it will hurt power consumption.
> 
> Oh, I completely missed that!

It suggests it'll harm power consumption because skew removal allegedly
saved power.  Recalling what removal did to my 8 socket box, I doubt
adding it back costs large boxen anything at all, rather the opposite.

	-Mike