Date: Mon, 17 Mar 2008 12:00:44 -0400 From: John Baldwin <jhb@freebsd.org> To: "Poul-Henning Kamp" <phk@phk.freebsd.dk> Cc: cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/i386/cpufreq est.c Message-ID: <200803171200.45273.jhb@freebsd.org> In-Reply-To: <3709.1205762533@critter.freebsd.dk> References: <3709.1205762533@critter.freebsd.dk>
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On Monday 17 March 2008 10:02:13 am Poul-Henning Kamp wrote: > In message <200803170933.48212.jhb@freebsd.org>, John Baldwin writes: > >On Monday 17 March 2008 05:01:43 am Poul-Henning Kamp wrote: > >> phk 2008-03-17 09:01:43 UTC > >> > >> FreeBSD src repository > >> > >> Modified files: > >> sys/i386/cpufreq est.c > >> Log: > >> Increase time we wait for things to settle to 1 millisecond, > >> 10 microseconds is too short. > >> > >> Always set the cpu to the highest frequency so that we get through > >> boot and don't handicap cpus where powerd(8) is not used. > > > >Hmm, I actually consider this a feature when I'm not running powerd to use > >less battery. I think we should only bump up the CPU on battery power when > >using powerd so that it can be lowered again to save battery power when the > >CPU is idle. > > We have cpufreq enabled by default now, badly configured machines run > at 50% of rated CPU power because people don't know that they need to > enable powerd(8) on servers. > > This is only going to get worse when more EnergyStar compliant servers > hit the channel. > > I think setting full speed is the correct choice, if people care about > powersaving, they need to configured it, if they don't they should get > their moneys worth out of their hardware. You have servers that default to half-speed when not on battery? That is very odd, but you can just run powerd with '-a max' and it will just set them to run full speed on startup which will work fine for you. I think the vast majority of machines that don't run at full speed on startup are machines on battery power and that the previous default was a more useful policy. We don't have any servers at work that have this bizzare behavior (and we have a lot of machines at work). -- John Baldwin
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