Date: Wed, 15 Jan 2003 03:28:41 -0800 From: Lars Eggert <larse@ISI.EDU> To: Dmitry Morozovsky <marck@rinet.ru> Cc: Peter Wemm <peter@wemm.org>, cvs-all@FreeBSD.ORG, Nate Lawson <njl@FreeBSD.ORG> Subject: Re: cvs commit: src/sys/dev/acpica acpi_cpu.c Message-ID: <3E2545E9.3080803@isi.edu> In-Reply-To: <20030114230057.81B422A89E@canning.wemm.org> References: <20030114230057.81B422A89E@canning.wemm.org> <20030115144353.U70329@woozle.rinet.ru>
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On Tue, 14 Jan 2003, Peter Wemm wrote:
>
> FWIW, we see a (measured) difference of about 50W on 2.2GHz P4's
> simply by turning machdep.cpu_idle_hlt on and off. I expect the
> clock throttling would make similar differences. For 1U
> rack-mount systems (especially in California) this is a Big Deal.
Since the AC in my office has a hard time with four new Dell SMPs, would
setting machdep.cpu_idle_hlt=1 translate to making them run cooler? They
have a pretty bursty workload, so many times they're idle, and sometimes
fully loaded - does the hlt setting affect performance?
Thanks,
Lars
--
Lars Eggert <larse@isi.edu> USC Information Sciences Institute
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