Comment 115 for bug 22336

The thing here I think is that when CPU throtles up due to processor needs,
and temperature rises... it should stop underclock if temperature rises to
much and come closer to critical temp, until temps comes down... but it
doesnt.
Thats the thing i think

2007/4/17, Paul Harrison <email address hidden>:
>
> I think some people are barking up the wrong tree with this one. There
> is a problem with the CPU overheating, but it has little or nothing to
> do with throttling, as the complaints are about the CPU overheating when
> CPU usage is *supposed* to be high (ie compiling applications, etc)
>
> Throttling is a technique meant to be used during periods of *low* CPU
> usage. The purpose is to reduce the power consumption of the CPU when it
> isn't doing much. You're not supposed to throttle the CPU when it's
> doing a lot of work except in a dire emergency, because that defeats the
> purpose of having a fast CPU in the first place. A CPU that's throttled
> whenever it's doing a lot of work is essentially one that may feel
> slightly more responsive than an equivalent machine with a CPU that runs
> at the slower speed by default, but is otherwise just as poorly
> performing.
>
> I have a Thinkpad T60. Until a couple of weeks ago, I was running Debian
> sarge with a 2.6.16 kernel. I can tell you what's different between it
> and the Feisty install I have today: on the Debian machine, when the
> fans needed to come on full blast, they did. On the Feisty install, they
> don't. Even typing "# echo level 7 > /proc/acpi/ibm/fan" to force the
> fans to their highest "supported" speed is not enough to actually get
> them to go at their documented rate. They certainly aren't making the
> same amount of noise. The only way I can permanently prevent my laptop
> from overheating is to override the rate control altogether with "# echo
> level disengaged > /proc/acpi/ibm/fan" which does get the fans up to
> full speed, but makes it permanent (whereas under Debian, the fans would
> only go to full speed if the laptop really was doing a lot of work. The
> various OpenGL screensavers and Unreal Tournament would do that.)
>
> If "level 7" fans meant the same thing under Feisty as it did under
> Sarge, I don't think there'd be a problem.
>
> I can manually enable throttling and have done so, but the result has
> been somewhat unusable: whenever I start anything from installing
> packages (gzip uses CPU...) to compiling a large program, the CPU speed
> plummets to something barely usable. I'm failing to see the point. I can
> see using it if the CPU approaches an unsafe temperature even when fans
> are on full blast (essentially as a last resort, to save the system from
> either burning up or turning off), but not if simply bumping up the fan
> speed would do the job.
>
> --
> CPU overheats during high usage "throttling <not supported>"
> https://bugs.launchpad.net/bugs/22336
> You received this bug notification because you are a direct subscriber
> of the bug.
>

--
Alejandro Zanotti
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"Hay 10 tipos de personas, las que saben leer binario y las que no"