From: Eric Sandall <eric@sandall.us>
To: Robert Hancock <hancockr@shaw.ca>
Cc: Dave Jones <davej@redhat.com>,
linux-kernel@vger.kernel.org, Mattia Dongili <malattia@linux.it>
Subject: Re: cpufreq and kernel >2.6.15.6 is limited
Date: Wed, 31 May 2006 16:30:46 -0700 [thread overview]
Message-ID: <447E2726.8020507@sandall.us> (raw)
In-Reply-To: <447D12D3.9050306@shaw.ca>
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Robert Hancock wrote:
> Dave Jones wrote:
>> On Tue, May 30, 2006 at 05:25:26PM -0700, Eric Sandall wrote:
>> > > It seems that any kernel on my Dell Inspiron 5100 after 2.6.15.6
>> > (including 2.6.17-rc5) 'breaks' my cpufreq in that up to and including
>> > 2.6.15.6 I can scale between 300MHz-2.4GHz, but after (starting with
>> > 2.6.16) I can only scale between 2.1GHz and 2.4GHz.
>> > > I've attached the files, sorted by kernel, I assume may be
>> helpful. Let
>> > me know if you need any more.
>>
>> It may have worked in the past, but the CPU has an errata which makes
>> it an unsafe operation to scale below 2GHz.
>
> There was some discussion about whether this was correct or not in this
> thread:
>
> http://groups.google.ca/group/fa.linux.kernel/browse_thread/thread/d5b5905d7f1aa221/66c41ee3a26583b3
>
>
> Did this ever get resolved? From my reading of the N60 erratum,
> disabling the 12.5% duty cycle sounds like this should be enough,
> disabling everything under 2GHz is not necessary..
I would definitely prefer that approach of removing the problem
frequency rather than all 8.
- -sandalle
- --
Eric Sandall | Source Mage GNU/Linux Developer
eric@sandall.us | http://www.sourcemage.org/
http://eric.sandall.us/ | SysAdmin @ Shock Physics @ WSU
http://counter.li.org/ #196285 | http://www.shock.wsu.edu/
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next prev parent reply other threads:[~2006-05-31 23:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <6imLa-3G2-11@gated-at.bofh.it>
[not found] ` <6in4s-44o-13@gated-at.bofh.it>
2006-05-31 3:51 ` cpufreq and kernel >2.6.15.6 is limited Robert Hancock
2006-05-31 23:30 ` Eric Sandall [this message]
2006-05-31 0:25 Eric Sandall
2006-05-31 0:40 ` Dave Jones
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