Date: Fri, 2 Dec 2005 14:49:13 +0100 From: Bruno Ducrot <ducrot@poupinou.org> To: Daniel O'Connor <doconnor@gsoft.com.au> Cc: freebsd-acpi@freebsd.org, freebsd-stable@freebsd.org, freebsd-questions@freebsd.org Subject: Re: cpufreq and changing driver Message-ID: <20051202134913.GD24254@poupinou.org> In-Reply-To: <200512022035.55854.doconnor@gsoft.com.au> References: <da5cd1900511300337t22728ec8y@mail.gmail.com> <20051201141724.GE17066@poupinou.org> <da5cd1900512020105t60c1191cw@mail.gmail.com> <200512022035.55854.doconnor@gsoft.com.au>
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On Fri, Dec 02, 2005 at 08:35:54PM +1030, Daniel O'Connor wrote: > On Fri, 2 Dec 2005 19:35, Marco Calviani wrote: > > > It's not present under powerd for the simple fact that to be efficient > > > in term of not being too intrusive (kernel to user data transfers, etc), > > > powerd can only provide a limited number of check per second (at this > > > time, 2 per second). But the current algorithm present in powerd is > > > not well suited in that case. You have to wait one demi-second > > > for the processor being put to full speed if the system was idle > > > before. > > > > Are there on the horizon any sort of plans to implement a newer and > > more efficient algorithm to increase the number of transition per > > second? Sorry but i've not understood why linux-cpufreqd is able to > > cope with those without being so intrusive..... > > I don't see why you can't run powerd more frequently, I do.. Unless your 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 CPU 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 FreeBSD, 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 > -- Bruno Ducrot -- Which is worse: ignorance or apathy? -- Don't know. Don't care.
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