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

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Date:	Fri, 8 Apr 2016 15:19:14 -0700
From:	"Doug Smythies" <dsmythies@...us.net>
To:	"'Mike Galbraith'" <umgwanakikbuti@...il.com>
Cc:	"'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>,
	"'Rik van Riel'" <riel@...hat.com>,
	"'Rafael J. Wysocki'" <rjw@...ysocki.net>
Subject: RE: [regression] cross core scheduling frequency drop bisected to 0c313cb20732

On 2016.04.08 14:00 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.

Mike:

Could you send me, or point me to, the program "pipe-test"?
So far, I have only found one, but it is both old and not
the same program you are running (based on print statements).

I realize I might not be to recreate your problem scenario anyhow,
I just want to try.

... Doug