linux-kernel - Re: power increase issue on light load

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Message-ID: <BANLkTi=KvKZtjFuDNxfKKAxysWUw4CiJecG8wnckYPvv9BzNrA@mail.gmail.com>
Date:	Tue, 28 Jun 2011 10:13:24 -0700
From:	Nikhil Rao <ncrao@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Alex, Shi" <alex.shi@...el.com>, "mingo@...e.hu" <mingo@...e.hu>,
	"Chen, Tim C" <tim.c.chen@...el.com>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	len.brown@...el.com
Subject: Re: power increase issue on light load

On Tue, Jun 28, 2011 at 7:59 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, 2011-06-28 at 08:02 +0800, Alex,Shi wrote:
>> > >
>> > > What happens if you try something like the below. Increased imbalance
>> > > might lead to more load-balance action, which might lead to more task
>> > > migration/waking up of cpus etc.
>> > >
>> > > If the below makes any difference, Nikhil's changes have a funny that
>> > > needs to be caught.
>> >
>> > Yes, it most remove the commit effect, So the power recovered.
>> >
>> > In fact the only suspicious I found is large imbalance, but that is
>> > the commit want ...
>>
>> Any further comments for this?
>
> I had a look over all that stuff, but I couldn't find an obvious unit
> mis-match in any of the imbalance code. Nikhil any clue?
>

Sorry for the late reply. My mailbox filters failed me :-(

Alex -- I'm looking into this issue. Will get back to you soon.

-Thanks,
Nikhil
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