Date: Sat, 22 Mar 2008 09:09:37 +0900 From: gnn@freebsd.org To: Robert Watson <rwatson@freebsd.org> Cc: arch@freebsd.org, Poul-Henning Kamp <phk@phk.freebsd.dk> Subject: Re: Power-Mgt (Was: Re: cvs commit: src/sys/i386/cpufreq est.c ) Message-ID: <m2myorliv2.wl%gnn@neville-neil.com> In-Reply-To: <20080318182358.F34016@fledge.watson.org> References: <5753.1205785282@critter.freebsd.dk> <20080318182358.F34016@fledge.watson.org>
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At Tue, 18 Mar 2008 18:26:11 +0000 (GMT), rwatson wrote: > > > I know we've talked about this, but I'll mention it for the benefits > of the mailing list: one of the things that makes performance an > "easy" target is that there are easy-to-gather metrics. Those > metrics may require knowledge of statistics and a lifetime of > experience to interpret correctly, but they are still numbers that > are easily generated and compared. To drive work in power > management, we would benefit from having similarly accessible > metrics. Are there any decent documents describing how to do power > use measurement, and are there any (relatively) accessible tools for > doing it with? For example, on notebooks, can we sample an ACPI > value before/after a benchmark, or do we really need to hook > something up to the power supply in order to get a useful number? > Queue did a series on this a while back, some decent articles and ideas in there: http://www.acmqueue.org/modules.php?name=Content&pa=list_pages_issues&issue_id=46 http://www.acmqueue.org/modules.php?name=Content&pa=showpage&pid=513 Later, George
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