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

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Message-ID: <1491291123.4294.28.camel@gmx.de>
Date:   Tue, 04 Apr 2017 09:32:03 +0200
From:   Mike Galbraith <efault@....de>
To:     Frederic Weisbecker <fweisbec@...il.com>
Cc:     Rik van Riel <riel@...hat.com>,
        Luiz Capitulino <lcapitulino@...hat.com>,
        Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [BUG nohz]: wrong user and system time accounting

On Mon, 2017-04-03 at 16:40 +0200, Frederic Weisbecker wrote:
> On Thu, Mar 30, 2017 at 03:35:22PM +0200, Mike Galbraith wrote:

> Nohz_full is already bad for powersavings anyway. CPU 0 always ticks :-)

OTOH, if a nohz_full set is doing what it was born to do, CPU0 tick
spikes won't be noticeable on your (pegged/glowing) watt meter :)