Date: Thu, 21 Sep 2000 21:08:48 -0400 (EDT) From: Kenneth Wayne Culver <culverk@wam.umd.edu> To: Mike Smith <msmith@FreeBSD.ORG> Cc: Warner Losh <imp@village.org>, current@FreeBSD.ORG Subject: Re: new idle_proc() makes my laptop very hot Message-ID: <Pine.GSO.4.21.0009212108290.8542-100000@rac2.wam.umd.edu> In-Reply-To: <200009212303.QAA62850@mass.osd.bsdi.com>
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My system fans always stay on... but again this is not in a laptop .. it is on my regular pc... ================================================================= | Kenneth Culver | FreeBSD: The best NT upgrade | | Unix Systems Administrator | ICQ #: 24767726 | | and student at The | AIM: muythaibxr | | The University of Maryland, | Website: (Under Construction) | | College Park. | http://www.wam.umd.edu/~culverk/| ================================================================= On Thu, 21 Sep 2000, Mike Smith wrote: > > My laptop does seem to run *MUCH* warmer than before as well. It runs > > hot to begin with, but with the latest kernels it runs really hot. It > > used to get this hot only when I compiled -j 4. I don't have ACPI > > enabled and am using UP kernel. There really needs to be a HLT in the > > idle loop to keep idle machines cools. > > If I remember from a discussion with John Baldwin, the reason we don't do > this (yet) is that HLT only wakes up when you take an interrupt, and > there are cases where we can't guarantee that we'll take an interrupt in > order to get us out of the HLT. > > > The thermal management code, iirc, works in conjunction with this by > > lower the clock rate when things aren't too loaded, but that is a > > fairly complex thign to wait for. It also seems to help mostly on > > lightly loaded machines. HLT helps more than you'd otherwise > > think...c > > HLT helps a lot, yes, but the thermal management code is responsible for > running the system fan(s) in ACPI mode as well as throttling the CPU. In > some cases, that's a real issue (eg. I'm building the world now and > extremely worried about how hot this system is because I forgot to turn > ACPI off first. 8) > > -- > ... every activity meets with opposition, everyone who acts has his > rivals and unfortunately opponents also. But not because people want > to be opponents, rather because the tasks and relationships force > people to take different points of view. [Dr. Fritz Todt] > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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