linux-kernel - Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732

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Message-ID: <1460214622.3714.8.camel@gmail.com>
Date:	Sat, 09 Apr 2016 17:10:22 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Doug Smythies <dsmythies@...us.net>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [regression] cross core scheduling frequency drop bisected to
 0c313cb20732

On Sat, 2016-04-09 at 14:33 +0200, Rafael J. Wysocki wrote:
> On Sat, Apr 9, 2016 at 8:40 AM, Mike Galbraith <umgwanakikbuti@...il.com> wrote:
> > On Fri, 2016-04-08 at 22:59 +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.
> > 
> > That sounds somewhat reasonable.  Too bad I don't have a super duper
> > watt meter handy.. seeing that you really really are saving me money
> > would perhaps make me less fond of those prettier numbers.
> 
> You can look at the turbostat Watts numbers ("turbostat --debug" and
> the last three columns of the output in turbostat as included in the
> kernel source).

Hm.  I think I want my prettier numbers back.

714KHz/877KHz = 0.81
25Watt/30Watt = 0.83

	-Mike