Date: Thu, 21 Sep 2000 17:10:51 -0600 From: Warner Losh <imp@village.org> To: Mike Smith <msmith@FreeBSD.ORG> Cc: current@FreeBSD.ORG Subject: Re: new idle_proc() makes my laptop very hot Message-ID: <200009212310.RAA62949@harmony.village.org> In-Reply-To: Your message of "Thu, 21 Sep 2000 16:03:02 PDT." <200009212303.QAA62850@mass.osd.bsdi.com> References: <200009212303.QAA62850@mass.osd.bsdi.com>
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In message <200009212303.QAA62850@mass.osd.bsdi.com> Mike Smith writes: : 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. I thought that's what the timer interrupts were for... We can't guarantee that we'll get one? That seems very serious to me. : > 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) Ah. I don't have a system fan :-) Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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