[Saucy Raring SRU] Add Haswell CPU models

[Colin Ian King]

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On 10/02/14 16:14, Stefan Bader wrote:
> On 10.02.2014 16:48, Luis Henriques wrote:
>> On Mon, Feb 10, 2014 at 06:19:31AM +0000, Zhang, Xiong Y wrote:
>>> Impact: Since Saucy and Raring distribution can support Haswell CPU.
>>>        But intel_pstate driver in these distributions can't support Haswell CPU.
>>>
>>> Fix: Add Haswell CPU models to intel_pstate driver
>>>
>>> Upstream commit:
>>> commit 6cdcdb793791f776ea9408581b1242b636d43b37
>>> Author: Nell Hardcastle <nell at spicious.com>
>>> Date:   Sun Jun 30 15:58:57 2013 -0700
>>>
>>> intel_pstate: Add Haswell CPU models
>>>
>>>
>>> Two bug fix commits in intel_pstate driver are valuable to do backport.
>>>
>>> 1.       7244cb6 intel_pstate: Correct calculation of min pstate value
>>>
>>> 2.       d253d2a intel_pstate: Improve accuracy by not truncating until final result
>>>
>>> thanks
>>
>> I have these 3 commits (plus an additional one: fcb6a15 "intel_pstate:
>> Take core C0 time into account for core busy calculation") already queued
>> for the 3.11 kernel as per request of Dirk Brandewie in the upstream
>> stable mailing list.  This means that, in a future SRU cycle, these will
>> hit the Ubuntu Saucy kernel.
>>
>> Kamal, could you please check the status of these patches for the 3.8
>> kernel (which will be included in the lts-backport-raring kernel)?
>>
>> Cheers,
>> --
>> Luis
>>
> When chatting with Colin this morning we were thinking that this would probably
> need the user-space driver to be backported/MRU? into Precise in order to be
> useful. Not sure we have thought about this...

The driver is disabled by default, and has to be enabled using
"intel_pstate=enabled" to get it working.  It is recommended that
thermald (which just landed in trusty) is used to ensure the CPU does
not get driven too hard (and get too hot).

Colin
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