linux-kernel - Re: [PATCH] x86 intel power: Initialize MSR_IA32_ENERGY_PERF

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Date:	Wed, 13 Jul 2011 16:51:01 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Pavel Machek <pavel@....cz>
Cc:	stable@...nel.org, Ingo Molnar <mingo@...e.hu>, x86@...nel.org,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] x86 intel power: Initialize MSR_IA32_ENERGY_PERF_BIAS

> Ok. So... what "serious bug" does this fix? You really need to use cc:
> stable less. Tweaking performance/power ratio is _not_ serious bug.

While the performance difference may not be significant,
the energy difference may be.

Some people think it is serious when Linux has worse out-of-box
energy efficiency than Windows on the same hardware.

Some people think that it is serious when their Linux distribution
has worse energy efficiency than competing Linux distributions.

Greg has given me a hard time for not cc'ing stable _enough_.
I guess the folks that answer the stable mail get to decide...

cheers,
-Len

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