Date: Fri, 2 Dec 2005 15:04:45 +0100 From: Marco Calviani <marco.calviani@gmail.com> To: freebsd-acpi@freebsd.org, freebsd-stable@freebsd.org, freebsd-questions@freebsd.org Subject: Re: cpufreq and changing driver Message-ID: <da5cd1900512020604p22e6a18fu@mail.gmail.com> In-Reply-To: <20051202134913.GD24254@poupinou.org> References: <da5cd1900511300337t22728ec8y@mail.gmail.com> <20051201141724.GE17066@poupinou.org> <da5cd1900512020105t60c1191cw@mail.gmail.com> <200512022035.55854.doconnor@gsoft.com.au> <20051202134913.GD24254@poupinou.org>
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Hi list, 2005/12/2, Bruno Ducrot <ducrot@poupinou.org>: > > I don't see why you can't run powerd more frequently, I do.. Unless you= r ACPI > > has a problem that means the transition is slow. > > I'm sure this could not be done under Linux without a lot of > problems (it is required to use the /proc things and it's too slow in > that case). > > > I can't imagine that doing 5 (or even 50) syscalls a second is a big CP= U load > > unless there is a specific problem with sysctls or the cpufreq > > infrastructure. > > If that's possible being not so intrusive with, say 50 syscalls under Fre= eBSD, > then all I said above is indeed stupid crap. > > > I run powerd like this -> > > /usr/sbin/powerd -i 90 -r 30 -a adaptive -b adaptive -n adaptive -p 200 > > Well, i've tried decreasing the polling interval, but there is an increased powerd cpu load: at 100ms polling interval the cpu load is to an astonishing 20% circa, which i think it's too much for a normal use. The sampling rate with ondemand governor in linux kernel is 10ms but cpufreqd is at 0.6% on average cpu load. Regards, MC
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