Date: Thu, 21 Sep 2000 23:49:45 +0000 From: Tony Finch <dot@dotat.at> To: Warner Losh <imp@village.org> Cc: Mike Smith <msmith@FreeBSD.ORG>, current@FreeBSD.ORG Subject: Re: new idle_proc() makes my laptop very hot Message-ID: <20000921234945.F5948@hand.dotat.at> In-Reply-To: <200009212310.RAA62949@harmony.village.org> References: <200009212303.QAA62850@mass.osd.bsdi.com> <200009212310.RAA62949@harmony.village.org>
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Warner Losh <imp@village.org> wrote: >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 problem is that one cpu may wich to schedule a process to run on the idle cpu, but it can't because the idle cpu is halted and won't wake up until the next irq. Tony. -- en oeccget g mtcaa f.a.n.finch v spdlkishrhtewe y dot@dotat.at eatp o v eiti i d. fanf@covalent.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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