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

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Date:	Sat, 04 May 2013 09:57:54 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	Dirk Brandewie <dirk.brandewie@...il.com>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>, 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 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.


>> Because the CPU will be running mostly at high(er) frequency - which
>> always results in a high temperature and short battery time.
>>
> 
> It would be better IMHO if the client software limited the resources
> it uses when the system is not on wall power but that is a seperate
> discussion :-)
> 
> --Dirk
> 
> 


-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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