linux-kernel - Re: [patch v7 0/21] sched: power aware scheduling

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Message-ID: <20130415231206.GE12144@pd.tnic>
Date:	Tue, 16 Apr 2013 01:12:06 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Alex Shi <alex.shi@...el.com>
Cc:	Len Brown <lenb@...nel.org>, mingo@...hat.com,
	peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, pjt@...gle.com,
	namhyung@...nel.org, efault@....de, morten.rasmussen@....com,
	vincent.guittot@...aro.org, gregkh@...uxfoundation.org,
	preeti@...ux.vnet.ibm.com, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org, len.brown@...el.com,
	rafael.j.wysocki@...el.com, jkosina@...e.cz,
	clark.williams@...il.com, tony.luck@...el.com,
	keescook@...omium.org, mgorman@...e.de, riel@...hat.com,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [patch v7 0/21] sched: power aware scheduling

On Mon, Apr 15, 2013 at 09:50:22PM +0800, Alex Shi wrote:
> For fairness and total threads consideration, powersaving cost quit
> similar energy on kbuild benchmark, and even better.
> 
> 	    17348.850		    27400.458		   15973.776
> 	    13737.493		    18487.248		   12167.816

Yeah, but those lines don't look good - powersaving needs more energy
than performance.

And what is even crazier is that fixed 1.2 GHz case. I'd guess in
the normal case those cores are at triple the freq. - i.e. somewhere
around 3-4 GHz. And yet, 1.2 GHz eats almost *double* the power than
performance and powersaving.

So for the x=8 and maybe even the x=16 case we're basically better off
with performance.

Or could it be that the power measurements are not really that accurate
and those numbers above are not really correct?

Hmm.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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