Date: Mon, 18 Apr 2005 20:02:25 -0500 From: Eric Anderson <anderson@centtech.com> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: freebsd-current@freebsd.org Subject: Re: powerd(8) Message-ID: <426458A1.7010008@centtech.com> In-Reply-To: <200504191026.55803.doconnor@gsoft.com.au> References: <20050418232944.271AD5D07@ptavv.es.net> <200504191026.55803.doconnor@gsoft.com.au>
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Daniel O'Connor wrote: > On Tue, 19 Apr 2005 08:59, Kevin Oberman wrote: > >>I also have found that changing the polling interval to 150 is an >>improvement. Half a second is just too long, IMHO. I also discovered >>that with my system (P4M) that some settings can use substantially more >>power than faster settings, so I have kludged an ugly hack to avoid >>those settings. These changes make a significant difference in power >>consumption. > > > Can you elaborate on these? > It may be worth adding a general algorithm to cull the frequency list powerd > uses based on this info. > Here's a quick perl script that does what I think he was doing. The lines that have "skipping" in it are inefficient. (sorry for the ugly perl) #!/usr/local/bin/perl $sysctl = `sysctl dev.cpu.0.freq_levels`; $sysctl =~ s/.+\: //; @vals = split/\s+/,$sysctl; $lastenergy = 0; foreach $val (@vals) { ($mhz, $energy) = split/\//,$val; $energypermhz = $energy/$mhz; $energypermhz = sprintf ("%0.3f", $energypermhz); if ($lastenergy == 0) { $lastenergy = $energy; } if ($energy > $lastenergy) { print "skipping $energypermhz -> $mhz - $energy\n"; } else { print "$energypermhz -> $mhz - $energy\n"; $lastenergy = $energy; } } -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology A lost ounce of gold may be found, a lost moment of time never. ------------------------------------------------------------------------
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