Date: Thu, 21 Sep 2000 17:59:25 -0600 From: Warner Losh <imp@village.org> To: Tony Finch <dot@dotat.at> Cc: Mike Smith <msmith@FreeBSD.ORG>, current@FreeBSD.ORG Subject: Re: new idle_proc() makes my laptop very hot Message-ID: <200009212359.RAA63352@harmony.village.org> In-Reply-To: Your message of "Thu, 21 Sep 2000 23:49:45 -0000." <20000921234945.F5948@hand.dotat.at> References: <20000921234945.F5948@hand.dotat.at> <200009212303.QAA62850@mass.osd.bsdi.com> <200009212310.RAA62949@harmony.village.org>
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In message <20000921234945.F5948@hand.dotat.at> Tony Finch writes: : 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. Since I'm running a UP kernel, that can't happen. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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