Messages in this thread | | | Date | Sun, 8 Oct 2006 23:18:21 +0200 | From | Pavel Machek <> | Subject | Re: BIOS THRM-Throttling and driver timings |
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Hi!
> > We have a motherboard that has Thermal Throttling in the BIOS (which > > we cannot disable). This causes the CPU usage to go up and down when > > the CPU temperature reaches (and stays around) the Throttling > > temperature point. > > > > What we would like to know is whether this will affect the timings in > > drivers, eg the wireless drivers we are using. What can we check in > > drivers' code that will tell us that its operations may be affected > > the throttling? > > > > In the past few days, we noticed that some of the linux units we > > deployed freezes after deveral hours of operation, we are now trying > > to reproduce the problem in our test environment. Some insight on the > > affect of throttling will help us narrow down the search.
> in general linux should be ok with this happening. However for specific > cases... you'll need to provide more information; you're not > mentioning
Really? AFAICT P4 will happily slow down behind our backs, making at least udelays() with interrupts disabled sleep for too long.
> (also: if you actually HIT throttling, there is something very very > wrong; you're not supposed to hit that unless the fan is defective, but > never in "normal" healthy operation. If you do hit it without hardware > defects then there is most likely a fundamental airflow problem you'll > want to fix urgently)
At least in toshiba notebook, I was hitting thermal throttling even through both fans were okay. There are many misdesigned machines out there, I fear. Pavel
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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