Date: Thu, 10 Sep 2009 12:18:03 +0930 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: Alexander Motin <mav@freebsd.org> Cc: FreeBSD Stable <freebsd-stable@freebsd.org>, Robert Noland <rnoland@freebsd.org> Subject: Re: Detecting CPU throttling on over temperature Message-ID: <200909101218.05070.doconnor@gsoft.com.au> In-Reply-To: <4AA7AA9B.9010709@FreeBSD.org> References: <1252426982.00160755.1252414203@10.7.7.3> <1252501703.85394.3473.camel@balrog.2hip.net> <4AA7AA9B.9010709@FreeBSD.org>
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--nextPart35789273.YECnIvQjDX Content-Type: text/plain; charset="koi8-r" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Wed, 9 Sep 2009, Alexander Motin wrote: > > around 100C. I did pull the c2d cpu docs at one point trying to > > look at cpufreq. If you are bored, you can grab the docs from > > intel and double check. > > AFAIR C2D supports three protection technologies. When CPU is hot, it > starts reducing frequency (multiplier) and voltage, alike to IEST. If > it is insufficient, it starts to skip core cycles, alike to TCC. If > it is still insufficient and temperature rises above about 100C, > emergency shutdown happens. Hmm, I have since realised it's an E2140 which doesn't have Core2Duo=20 branding (I don't know if it really IS one or not). On the bench here I could not observe an effect by running=20 dd if=3D/dev/zero bs=3D128k count=3D5000| md5 in a loop and checking the frequency with dev.cpu.0.freq However the idle time seemed to go up, but only to 10% or so, it was=20 quite odd.. Still, now I have been reminded of coretemp I can monitor it=20 on "suspect" systems :) =2D-=20 Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C --nextPart35789273.YECnIvQjDX Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (FreeBSD) iD8DBQBKqGjl5ZPcIHs/zowRArbWAJ9EYE3AtaH+QDh3nivHF4KP2LdDfQCdHFvV p7ZqB+hT5CpdwLktrQqFE78= =Ct6F -----END PGP SIGNATURE----- --nextPart35789273.YECnIvQjDX--
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