From: Mike Galbraith <umgwanakikbuti@gmail.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux PM list <linux-pm@vger.kernel.org>,
Doug Smythies <dsmythies@telus.net>,
Rik van Riel <riel@redhat.com>
Subject: Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732
Date: Sun, 10 Apr 2016 17:39:57 +0200 [thread overview]
Message-ID: <1460302797.4383.44.camel@gmail.com> (raw)
In-Reply-To: <CAJZ5v0j-5Eva2QReG4LHvyZR-iL5rrrWp-3erdfz-u+5xbwRKA@mail.gmail.com>
On Sat, 2016-04-09 at 14:31 +0200, Rafael J. Wysocki wrote:
> On Sat, Apr 9, 2016 at 1:07 PM, Peter Zijlstra <peterz@infradead.org>
> wrote:
> > On Fri, Apr 08, 2016 at 10:59:59PM +0200, Rafael J. Wysocki wrote:
> > > On Friday, April 08, 2016 08:50:54 AM Mike Galbraith wrote:
> > > > On Fri, 2016-04-08 at 08:45 +0200, Peter Zijlstra wrote:
> > > >
> > > > > Cute, I thought you used governor=performance for your runs?
> > > >
> > > > I do, and those numbers are with it thus set.
> > >
> > > Well, this is a trade-off.
> > >
> > > 4.5 introduced a power regression here so this one goes back to
> > > the previous
> > > state of things.
> >
> > Just for my elucidation; how can gov=performance have a 'power'
> > regression?
>
> Because of what is used as the "default" idle state most of the time.
>
> C1 was used before 4.5 and that changed to polling in 4.5.
Should the default idle state not then be governor dependent? When I
set gov=performance, I'm expecting box to go just as fast as it can go
without melting. Does polling risk CPU -> lava conversion?
-Mike
next prev parent reply other threads:[~2016-04-10 15:40 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1460092854.4051.1.camel@gmail.com>
[not found] ` <20160408064510.GK3448@twins.programming.kicks-ass.net>
[not found] ` <1460098254.5582.17.camel@gmail.com>
2016-04-08 20:59 ` [regression] cross core scheduling frequency drop bisected to 0c313cb20732 Rafael J. Wysocki
2016-04-08 22:19 ` Doug Smythies
2016-04-09 6:44 ` Mike Galbraith
2016-04-09 7:17 ` Doug Smythies
2016-04-09 7:27 ` Mike Galbraith
2016-04-09 11:08 ` Peter Zijlstra
2016-04-09 6:40 ` Mike Galbraith
2016-04-09 12:33 ` Rafael J. Wysocki
2016-04-09 15:10 ` Mike Galbraith
2016-04-09 16:39 ` Mike Galbraith
2016-04-10 3:44 ` Rafael J. Wysocki
2016-04-10 7:16 ` Doug Smythies
2016-04-10 9:35 ` Mike Galbraith
2016-04-10 14:54 ` Mike Galbraith
2016-04-09 11:07 ` Peter Zijlstra
2016-04-09 12:31 ` Rafael J. Wysocki
2016-04-10 15:39 ` Mike Galbraith [this message]
2016-04-10 20:24 ` Rik van Riel
2016-04-11 3:04 ` Mike Galbraith
2016-04-11 12:38 ` Rik van Riel
2016-04-11 13:21 ` Rafael J. Wysocki
2016-04-11 13:38 ` Rik van Riel
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