linux-kernel - Re: 3.9.0 + CONFIG_X86_INTEL_PSTATE=y -> ThinkPad T420 with i5 lost ACPI functionality

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Date:	Fri, 10 May 2013 15:10:12 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	Dirk Brandewie <dirk.brandewie@...il.com>,
	linux-acpi@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	boinc_dev@....berkeley.edu
Subject: Re: 3.9.0 + CONFIG_X86_INTEL_PSTATE=y  -> ThinkPad T420 with i5 lost ACPI functionality

On Saturday, May 04, 2013 09:57:54 AM Toralf Förster wrote:
> On 05/03/2013 11:43 PM, Dirk Brandewie wrote:
> > On 05/03/2013 02:26 PM, Toralf Förster wrote:
> >> On 05/03/2013 11:10 PM, Dirk Brandewie wrote:
> >>>
> >>> ignore_nice_load is a feature of the ondemand governor.
> >>> The intel_pstate driver is seeing the load presented by the BOINC client
> >>> and is adjusting the pstate accordingly.
> >>
> >> Is the intel_pstate driver a choice for a notebook and friends where a
> >> grid software is running as a low-prio back ground job ?
> >>
> > 
> > Probably not.
> 
> Hhm.
> 
> The kernel menuconfig says :
> 
>  This driver provides a P state for Intel core processors
>  The driver implements an internal governor and will become
>  the scaling driver and governor for Sandy bridge processors.
> 
> 
> What shall a company like IBM with a lot of notebook installation running BOINC
> in the back ground process (World Community Grid) do - what's the consequence for
> those installations if they will have that a processor ?
> 
> In the past (few years ago and related to the ondemand governor IIRC) there were
> already a longer discussion about the "nice -n 19" topic and the result was
> to support it.
> 
> /me Cc:'ing boinc devs, the topic might be interesting for them too.

One option might be to use the powerclamp driver along with intel_pstate to
reduce the heat dissipation.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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