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Re: Launching g-p-m in gdm, Was: too many deamons by default - F7 test 2 live cd



On Wed, Mar 21, 2007 at 12:08:49PM +0100, Thorsten Leemhuis wrote:
 > 
 > On 21.03.2007 11:35, Richard Hughes wrote:
 > > On Wed, 2007-03-21 at 11:22 +0100, Thorsten Leemhuis wrote:
 > >> P.S.: I'd further say the cpufreq stuff should be enabled early in the
 > >> boot-process -- gdm seems quite late for me.
 > >
 > > At startup we are not idle, or at least shouldn't be, and we gain little
 > > from switching to a different governor at startup in my opinion.
 > 
 > Sure, but we need to set one afaics because...
 > 
 > > Whilst we are in the initscripts we *should* be at 100% utilization on
 > > as many CPUs as we have for speed, so power saving doesn't really apply.
 > 
 > ...we are I/O bound often during startup afaics (at least these days)
 > and the CPU is often fast enough when on lower frequency.

We still do enough CPU bound stuff that will make this noticable.
It'll add a few seconds onto the boot time.

 > Currently the default kernel gov is userspace:
 > 
 > $ grep DEFAULT_GOV /boot/config-2.6.20-1.2997.fc7
 > # CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
 > CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
 > 
 > So no power savings until something takes care of it afaics (or am I
 > wrong with that? anyway, that could probably easily be adjusted until F8).

if the userspace power management stuff starts really early in the
initscripts, there's no problem here.

	Dave

-- 
http://www.codemonkey.org.uk


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