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Date: Tue, 4 May 2010 06:16:57 +0200 From: Willy Tarreau <w@....eu> To: Arjan van de Ven <arjan@...radead.org> Cc: Thomas Renninger <trenn@...e.de>, Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org, akpm@...ux-foundation.org, mingo@...e.hu, peterz@...radead.org, tglx@...utronix.de, davej@...hat.com, cpufreq@...r.kernel.org, riel@...hat.com Subject: Re: [PATCH 8/7] cpufreq: make the iowait-is-busy-time a sysfs tunable On Mon, May 03, 2010 at 08:48:18PM -0700, Arjan van de Ven wrote: > From: Arjan van de Ven <arjan@...ux.intel.com> > Subject: [PATCH] cpufreq: make the iowait-is-busy-time a sysfs tunable > > Pavel Machek pointed out that not all CPUs have an efficient idle > at high frequency. Specifically, older Intel and various AMD cpus > would get a higher power usage when copying files from USB. > > Mike Chan pointed out that the same is true for various ARM chips > as well. > > Thomas Renninger suggested to make this a sysfs tunable with a > reasonable default. > > This patch adds a sysfs tunable for the new behavior, and uses > a very simple function to determine a reasonable default, depending > on the CPU vendor/type. > > Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com> > --- That's very nice Arjan. That way we'll be able to select between performance and power savings, which is what most laptop users want after all ! Thanks, Willy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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