Date: Wed, 09 Sep 2009 07:21:33 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Daniel O'Connor <doconnor@gsoft.com.au> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: Detecting CPU throttling on over temperature Message-ID: <4AA72D4D.9080505@FreeBSD.org> In-Reply-To: <200909091018.10509.doconnor@gsoft.com.au> References: <1252426982.00160755.1252414203@10.7.7.3> <4AA6860F.1020203@FreeBSD.org> <200909091018.10509.doconnor@gsoft.com.au>
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Daniel O'Connor wrote: > On Wed, 9 Sep 2009, Alexander Motin wrote: >> Daniel O'Connor wrote: >>> I recently discovered a system where the floppy drive cable was >>> intermittently fouling the CPU fan - I believe this caused the CPU >>> to overheat and then get throttled by the BIOS. >>> >>> Does anyone know if it is possible to determine if this is the >>> case? ie is there a way to be informed if throttling has occurred? >> Theoretically it is possible. I know off-topic tool reporting this. >> Also you can just monitor CPU temperature, depending on CPU type. > > Monitoring CPU temperature is a bit difficult, there are a lack of tools > (although I have some code it's not complete). There indeed problems with MB monitoring, as it is non-standard. But modern CPUs also include on-chip thermal sensors. For Core2Duo family coretemp module works fine and precisely. > The problem is that the CPU temperature is only a proxy measurement, I > would much prefer to be told directly the BIOS is throttling rather > than guess :) While ACPI could implement thermal throttling, AFAIK TM1/TM2 technologies of P4 and above families are working just in CPU hardware. BIOS only initializes them. -- Alexander Motin
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