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From: Pavel Machek <pavel@ucw.cz>
To: Len Brown <lenb@kernel.org>, stable@kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-pm@lists.linux-foundation.org,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@infradead.org>
Subject: Re: [PATCH] x86 intel power: Initialize MSR_IA32_ENERGY_PERF_BIAS
Date: Wed, 20 Apr 2011 15:14:42 +0200	[thread overview]
Message-ID: <20110420131442.GA29418__3090.68756546385$1303305436$gmane$org@atrey.karlin.mff.cuni.cz> (raw)
In-Reply-To: <alpine.LFD.2.02.1104150202310.29365@x980>


> > > However, the typical BIOS fails to initialize the MSR,
> > > and the typical Linux distro neglects to invoke x86_energy_perf_policy(8).
> > > 
> > > The result is that some modern hardware is running in hardware default,
> > > which is "performance" mode, rather than the intended design default
> > > of "normal" mode.
> > > 
> > > Initialize the MSR to the "normal" setting during kernel boot.
> > > 
> > > Of course, x86_energy_perf_policy(8) is available to change
> > > the default after boot, should the user have a policy preference.
> > > 
> > > cc: stable@kernel.org
...
> Will it be possible to measure a performance difference between
> "performance" and "normal"?  Yes, it will be possible.

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


									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  parent reply	other threads:[~2011-04-20 13:14 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-30 22:21 [PATCH] x86 intel power: Initialize MSR_IA32_ENERGY_PERF_BIAS Len Brown
2011-04-14  9:08 ` Ingo Molnar
2011-04-15  6:25   ` Len Brown
2011-04-15 10:17     ` Ingo Molnar
2011-07-13 20:44       ` Len Brown
2011-07-13 20:44         ` Len Brown
2011-07-13 20:49         ` Linus Torvalds
2011-07-13 20:49           ` Linus Torvalds
2011-07-13 21:38           ` H. Peter Anvin
2011-07-13 21:38           ` H. Peter Anvin
2011-07-14  4:53             ` [PATCH v2] " Len Brown
2011-07-14 19:35               ` Rafael J. Wysocki
2011-07-14 19:35               ` Rafael J. Wysocki
2011-07-14 21:12               ` [tip:x86/cpu] x86, intel, " tip-bot for Len Brown
2011-07-15  0:18                 ` [tip:x86/cpu] x86, msr: Fix typo in ENERGY_PERF_BIAS_POWERSAVE tip-bot for H. Peter Anvin
2011-07-15 21:37               ` [PATCH v3] x86 intel power: Initialize MSR_IA32_ENERGY_PERF_BIAS Len Brown
2011-07-15 21:37               ` Len Brown
2011-07-16 18:52                 ` [tip:x86/cpu] x86, intel, power: Correct the MSR_IA32_ENERGY_PERF_BIAS message tip-bot for Len Brown
2011-08-18 17:23                   ` Christoph Fritz
2011-07-14  4:53             ` [PATCH v2] x86 intel power: Initialize MSR_IA32_ENERGY_PERF_BIAS Len Brown
2011-04-15 10:17     ` [PATCH] " Ingo Molnar
2011-04-20 13:14     ` Pavel Machek
2011-07-13 20:51       ` Len Brown
2011-07-13 20:51       ` Len Brown
2011-04-20 13:14     ` Pavel Machek [this message]
2011-04-15  6:25   ` Len Brown
2011-04-14  9:08 ` Ingo Molnar
  -- strict thread matches above, loose matches on Subject: below --
2011-03-30 22:21 Len Brown

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