linux-kernel - Re: [BUG nohz]: wrong user and system time accounting

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Message-ID: <1490879944.4702.52.camel@gmx.de>
Date:   Thu, 30 Mar 2017 15:19:04 +0200
From:   Mike Galbraith <efault@....de>
To:     Frederic Weisbecker <fweisbec@...il.com>,
        Wanpeng Li <kernellwp@...il.com>
Cc:     Rik van Riel <riel@...hat.com>,
        Luiz Capitulino <lcapitulino@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [BUG nohz]: wrong user and system time accounting

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