From: Riccardo Vestrini <riccardov@sssup.it>
To: linux-laptop@vger.kernel.org
Subject: Re: is it really better speedstep-ich vs. p4-clockmod cpufreq driver?
Date: Fri, 23 Jul 2004 01:10:07 +0200 [thread overview]
Message-ID: <4100494F.1020803@sssup.it> (raw)
In-Reply-To: <Pine.LNX.4.58.0407220902350.9845@simba.math.ucla.edu>
Jim Carter wrote:
> On Thu, 22 Jul 2004, Riccardo Vestrini wrote:
>>it seems that speedstep-ich and acpi cpufreq driver have only two
usable clock
>>frequencies, while p4-clockmod has eight
>>my cpu is: Intel Mobile Intel(R) Pentium(R) 4 CPU 3.06GHz stepping 09
>
>
> Definitely the voltage modulation is important to have.
you right, but I do not know if it is better to have a 0.3 GHz clock
most of the time, or a 1.5 GHz with half voltage
>
> Also as for strategies, if you have dynamic speed modulation, generally if
> the CPU is busy less than 73% of the time, then my machine should be run at
> the lowest speed, whereas if tasks are waiting to run then it should be put
> in the highest speed. In a typical workload it's very rare for the needed
> throughput to be steadily between 73% and 100% so the intermediate speeds
> could be useful; this is true even if the available speed range is greater.
> Actually, hardly anyone uses the full capacity of their CPU, and I don't
> even bother to run the dynamic modulation daemon, just leaving it at low
> speed all the time. I switch manually if I have a big simulation to do.
>
it is the same for me, cpu is almost always set to the lowest frequency,
but I often compile programs, so I need the full power
I consider strange the fact that a more specific driver
(speedstep-ich) is not able to put my laptop to half voltage + mininum
clock (which is 0.3 GHz) while p4-clockmod is only able to adjust clock
and not voltage;
probably these capabilities can be merged some way ...
I will try to write the authors
thank you
--
Riccardo Vestrini
<riccardov@sssup.it>
"Io ho una deformazione professionale, sono Ingegnere, e il problema in
quello che lei dice è l'essere umano, perché una macchina può sbagliare
ma l'essere umano ha sicuramente molti più difetti" --
sconosciuto ad un congresso, mentre un manager parlava di risorse umane
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prev parent reply other threads:[~2004-07-22 23:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-22 9:28 is it really better speedstep-ich vs. p4-clockmod cpufreq driver? Riccardo Vestrini
2004-07-22 16:20 ` Jim Carter
2004-07-22 23:10 ` Riccardo Vestrini [this message]
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