Re: performance with Crusoe
Hi,
AFAIK Crusoe is designed to run at low speed until the system asks for full power (eg: while doing nothing run at low speed to maximize battery life and minimize heating, while doing hard work switch to full speed to maximize performance).
>From Transmeta site I can see that this cpu is windoze certified, that means that windoze has a driver to handle crusoe power management and ask for more power when needed. Linux still hasn't this kind of policy based PM for P-states.
Take a look at ACPI and CPUFREQ patches.
These are just my assumptions and perhaps not completely correct. Can somebody confirm?
--
mattia
On Thu, 5 Sep 2002 21:05:31 -0700
Jaye Inabnit ke6sls <ke6sls@cox.net> wrote:
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> On Thursday 05 September 2002 06:24 pm, steve thompson wrote:
> > I am running Debian 3.0 with the 2.4.18 kernel on a
> > Fujitsu P-2040, which has
> > a Transmeta Crusoe 800MHz processor and 256
> > MB of ram. The laptop also
> > dual boots Windows XP. I was comparing processing
> > times
> > with the two operating systems on the same machine
> > to run various calculations, random number
> > generations,
> > and graphics (using the same statistical program and
> > version (in R) on both sides. What I find is, first,
> > Linux
> > will handle a much larger problem than XP. But for
> > some intermediate sized problems, the total processing
> > time was about 10 to 20 percent faster with XP.
>
> This discovery doesn't really surprise me after seeing how hard and well
> Linux works on my systems. Another test, though this is about the most
> processor intensive, is setiathome (try it for yourself for the sake of
> science). My box currently completes a work unit every 3.5(ish) hours.
> Fortunately, I don't have windows to compare it too! I started to run it on
> my laptop while it is on AC power, but discovered it was getting dangerously
> hot, even with the fan on.
>
> > This is in contrast to what I found with the desktop
> > I work on, which has a similar setup with Debian 3.0
> > with the 2.4.18 kernel dual booting with Windows XP.
> > There, as well as handling
> > much larger problems, Linux does the processing
> > consistently 20 to 80 percent faster. That machine
> > has a Pentium IV 2.2 MHz processor and 1 GB of rdram.
> > But in each case the comparison is within machine.
>
> Yes, but if your new processor is a Transmeta then it would seem like it is
> living up to the company specifications, or at least that is what I have come
> to understand.
>
> > What this makes me wonder is if Linux, or my
> > particular
> > configuration, may not be as efficient as it could be
> > for the Crusoe. I do have something called "crusoe"
> > enabled in the kernel configuration. And I installed
> > a patch that people use to make DMA work with the
> > P-2000 series.
>
> What does this patch actually do? I think Transmeta is attempting to make a
> leaner chip that consumes less current, therefore causes less heat which
> greatly extends the useful charge of each laptop power pack. So, does this
> patch perhaps enable Linux to scale back a little to enable the chip's
> performance characteristics?
>
> > Does anyone have any similar experience or advice
> > regarding a laptop with the Crusoe?
>
> I don't, but your story is most assuredly grasping my attention! I hope you
> can drop another mail as you learn more about what you own.
>
> > Incidently, I really like that processor for what I
> > use this laptop for, even though it may not be the
> > fastest. What I like, compared to my previous
> > Pentium-based laptop, is the way it stays so quiet
> > and cool while I work. But I am wondering if Linux
> > might use this processor less efficiently than
> > possible
> > or if it is more likely something about my
> > configuration.
> >
> > Steve
>
> gl Steve,
>
> tatah
> - --
>
> Jaye Inabnit\ARS ke6sls\/A GNU-Debian linux user\/ http://www.qsl.net/ke6sls
> If it's stupid, but works, it ain't stupid. I SHOUT JUST FOR FUN.
> Free software, in a free world, for a free spirit. Please Support freedom!
>
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