From: Len Brown <lenb@kernel.org>
To: Jason Chagas <jason.chagas@gmail.com>
Cc: Linux Power Management List <linux-pm@lists.osdl.org>
Subject: Re: RFC: /sys/power/policy_preference
Date: Thu, 17 Jun 2010 14:44:41 -0400 (EDT) [thread overview]
Message-ID: <alpine.LFD.2.00.1006171441160.4214@localhost.localdomain> (raw)
In-Reply-To: <AANLkTinVfSUnR5cAvNowtzg8WEgm0JroN1EiaWAd2iHB@mail.gmail.com>
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On Wed, 16 Jun 2010, Jason Chagas wrote:
> > powersave (can sacrifice measurable performance)
> > scheduler: enable sched_smt_power_savings
> > cpuidle: enable all C-states, subject to QOS
> > ondemand: disable turbo mode, powersave_bias=10
> > msr_ia32_energy_perf_bias: 11 of 15
> >
>
> Do you have any pointers to info (or code) on how the different
> C&P-states are selected within each level?
I'm not proposing any changes to how the cpuidle menu govenor
selects C-states, or how it obeys PM_QOS, except for 1 thing.
I am proposing that in "max_performance" mode that C-states
be disabled entirely, to avoid any state latency whatsoever.
thanks,
Len Brown, Intel Open Source Technology Center
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next prev parent reply other threads:[~2010-06-17 18:44 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-16 21:05 RFC: /sys/power/policy_preference Len Brown
2010-06-16 22:12 ` Jason Chagas
2010-06-17 18:44 ` Len Brown [this message]
2010-06-17 6:03 ` [linux-pm] " Igor.Stoppa
2010-06-17 19:00 ` Len Brown
2010-06-17 16:14 ` Victor Lowther
2010-06-17 19:02 ` Len Brown
2010-06-17 22:23 ` Victor Lowther
2010-06-18 5:56 ` Len Brown
2010-06-18 11:55 ` Victor Lowther
2010-06-19 15:17 ` Vaidyanathan Srinivasan
2010-06-19 19:04 ` Rafael J. Wysocki
2010-06-17 20:48 ` Mike Chan
2010-06-18 6:25 ` Len Brown
2010-06-21 20:10 ` [linux-pm] " Dipankar Sarma
2010-09-28 16:17 ` x86_energy_perf_policy.c Len Brown
2010-10-23 4:40 ` [PATCH] tools: add x86_energy_perf_policy to program MSR_IA32_ENERGY_PERF_BIAS Len Brown
[not found] ` <alpine.LFD.2.00.1010230035360.29399@localhost.localdomain>
2010-10-27 3:23 ` Andrew Morton
[not found] ` <20101026202307.c028e26c.akpm@linux-foundation.org>
2010-10-27 6:01 ` Ingo Molnar
[not found] ` <20101027060139.GB5603@elte.hu>
2010-10-27 11:43 ` Arnaldo Carvalho de Melo
2010-11-15 16:07 ` [PATCH RESEND] tools: add power/x86/x86_energy_perf_policy " Len Brown
[not found] ` <alpine.LFD.2.00.1011151103280.2939@x980>
2010-11-17 11:35 ` Andi Kleen
[not found] ` <8739r0rxlz.fsf@basil.nowhere.org>
2010-11-22 20:13 ` Len Brown
[not found] ` <alpine.LFD.2.00.1011221348200.19247@x980>
2010-11-22 20:33 ` Andi Kleen
[not found] ` <20101122203359.GD21836@basil.fritz.box>
2010-11-23 4:48 ` Len Brown
2010-11-24 5:31 ` [PATCH v2] tools: create power/x86/x86_energy_perf_policy Len Brown
[not found] ` <alpine.LFD.2.00.1011240028470.20657@x980>
2010-11-25 5:52 ` Chen Gong
[not found] ` <4CEDF9BB.9030002@linux.intel.com>
2010-11-25 8:59 ` Chen Gong
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