Date: Thu, 11 Jan 2007 05:36:43 +1100 From: Peter Jeremy <peterjeremy@optushome.com.au> To: George Hartzell <hartzell@alerce.com> Cc: freebsd-stable@freebsd.org Subject: Re: saving power in a Dell Poweredge 750. Message-ID: <20070110183643.GI832@turion.vk2pj.dyndns.org> In-Reply-To: <17829.9117.888327.881204@rosebud.alerce.com> References: <17829.9117.888327.881204@rosebud.alerce.com>
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--AjmyJqqohANyBN/e Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, 2007-Jan-10 09:34:21 -0800, George Hartzell wrote: >I hooked my kill-a-watt meter up and ran the machine for a couple of >days and it uses 88 watts (3.90KWH/44.01H). What was it doing for those couple of days? If it was just sitting idle then I would expect the power consumption to be fairly close to what you get with powerd. If you want to see peak power consumption, try running a buildworld, something very FP intensive and something that is thrashing the disk(s) (lots of seeks and writes), all in parallel. >Then I kldloaded cpufreq and enabled powerd and it still uses 88 watts >(8.35KWH/93.47H). I presume you confirmed that cpufreq/powerd was actually functioning (ie the CPU frequency was being changed). >That surprised me a bit, and seems to suggest that it's spending most >of its energy spinning fans or something. PSU overheads, fans, northbridge, video, RAM, disk, ... it all adds up. I can't specifically help with the Dell. --=20 Peter Jeremy --AjmyJqqohANyBN/e Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (FreeBSD) iD8DBQFFpTI7/opHv/APuIcRAqxSAKCg7Bi2FJpzW+fWF8oRDxBvzJSJBwCgvKwR iDCohclXAYXTRvSj7qZ4Jp8= =utyC -----END PGP SIGNATURE----- --AjmyJqqohANyBN/e--
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