Date: Sat, 3 Jan 2009 11:54:15 +0100 From: Jeremie Le Hen <jeremie@le-hen.org> To: Alexander Motin <mav@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r185050 - head/usr.sbin/powerd Message-ID: <20090103105415.GA40686@obiwan.tataz.chchile.org> In-Reply-To: <200811181324.mAIDOcOc079096@svn.freebsd.org> References: <200811181324.mAIDOcOc079096@svn.freebsd.org>
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Hi Alexander, On Tue, Nov 18, 2008 at 01:24:38PM +0000, Alexander Motin wrote: > Author: mav > Date: Tue Nov 18 13:24:38 2008 > New Revision: 185050 > URL: http://svn.freebsd.org/changeset/base/185050 > > Log: > Set of powerd enchancements: > > 1. Make it more SMP polite. Previous version uses average CPU load that > often leads to load underestimation. It make powerd with default > configuration unusable on systems with more then 2 CPUs. I propose to use > summary load instead of average one. IMO this is the best we can do without > specially tuned scheduler. Also as soon as measuring total load on SMP > systems is more useful then total idle, I have switched to it. > > 2. Make powerd's operation independent from number and size of frequency > levels. I have added internal frequency counter which translated into real > frequencies only on a last stage and only as good as gone. Some systems may > have only several power levels, while others - many of them, so adaptation > time with previous approach was completely different. > > 3. As part of previous I have changed adaptive mode to rise frequency on > demand up to 2 times and fall on 1/8 per time internal. > > 4. For desktop (AC-powered) systems I have added one more mode - "hiadaptive". > It rises frequency twice faster, drops it 4 times slower, prefers twice > lower CPU load and has additional delay before leaving the highest frequency > after the period of maximum load. This mode was specially made to improve > interactivity of the systems where operation capabilities are more > significant then power consumption, but keeping maximum frequency all the > time is not needed. > > 5. I have reduced default polling interval from 1/2 to 1/4 of second. > It is not so important for algorithm math now, but gives better system > interactivity. Thanks for this work! Can you consider MFC'ing this to RELENG_7 and maybe RELENG_6 please? Thanks. Regards, -- Jeremie Le Hen < jeremie at le-hen dot org >< ttz at chchile dot org >
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