Date: Sat, 29 Jun 2002 15:28:29 +0200 From: "stunn0r" <stunn0r@beastie.kick-ass.org> To: <stable@freebsd.org> Subject: Re: [stable] Suspend on HLT problem Message-ID: <002c01c21f70$db728970$030a0a0a@w00t> References: <20020629013133.68291.qmail@web11206.mail.yahoo.com>
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this is actually a documented feature.. you can find the documentation @ http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/funnies.html#DEV-NULL :) ----- Original Message ----- From: "Rhett Monteg Hollander" <victorysoldier@yahoo.com> To: <freebsd-stable@freebsd.org> Sent: Saturday, June 29, 2002 3:31 AM Subject: [stable] Suspend on HLT problem > Hello all, > just recently I've noticed some strange thing going > with FreeBSD on some SMP box. > > After some period of time (about an hour, for > example), keeping this box booted into FreeBSD and > staid just powered on, generally doing nothing (no > background or foreground tasks), both CPUs appeared to > be very > hot (touching heatsink I could figure about 60-70C). > But kernel was compiled with 'options CPU_SUSP_HLT', > so FreeBSD had to halt both CPUs for quite a long > time, thereby keeping them cold. > > I recompiled the kernel again and again, no > difference. Then I made a uni-processing kernel, and > booted it for an hour. First (BSP) CPU was still hot, > however about 50C, while second (AP) was obviously > cold. I can somewhat explain why BSP CPU was hot not > so much than in SMP mode, because both CPUs use the > same cooling system, but I have no explanation why it > was still hot. > > Finally, I installed Linux and even Win2000 to see any > difference. And in both cases, both CPUs were really > cold, not exceeding 30-35C. > > I don't know what's going on. Either suspend on HLT > algorithm is not effective, or it's broken at all. > Anyone with SMP box can test it simply by booting up, > turning coolers off and waiting at least for half an > hour. If I'm wrong, your box won't hang up ;) > > Rhett > > P.S. FYI, 1) my brain probably performs fine, so > 2) I don't live in Central Sahara, hence > 3) room temperature was 23C :) > > __________________________________________________ > Do You Yahoo!? > Yahoo! - Official partner of 2002 FIFA World Cup > http://fifaworldcup.yahoo.com > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message > _______________________________________________ > Freebsd-stable mailing list > Freebsd-stable@spitfire.velocet.net > http://spitfire.velocet.net/mailman/listinfo/freebsd-stable > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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