Re: Bug#110273: ITP: lvcool -- "cools" the AMD K7 (Athlon/Duron) CPU
On Thu, Aug 30, 2001 at 01:07:07PM +0200, Jan Niehusmann wrote:
> On Tue, Aug 28, 2001 at 01:36:03AM +0200, Eduard Bloch wrote:
> > the CPU with no extra stuff, just APM and HLT-when-idle has about 55°C.
> > With ACPI, it has about 50-52°C. With the vcool-kernel-hack about
> > 45-48°C, and with the LVcool <40°C. All this on typical work - mail
>
> I did some measurements of the power consumption of my computer.
> Unfortunately, I can't see the effects of lvcool there.
> Results:
> 2.4.9ac3 idle without lvcool 82 watts
> 2.4.9ac3 idle with lvcool 82 watts
> 2.4.9ac3 compiling a kernel 90 watts
> 2.4.8ac7 with lvcool kernel patch 82 watts
>
> Maybe this is just a problem of the cheap power consumption monitor I used,
> which may not be able to properly measure the power consumption of a switching
> power supply,
Exactly that. The common power cunsumption monitor is designed for
household appliances. It gives totally bogus numbers for switching
power supplies since they don't draw current continuously.
Look at the numbers: 90W for kernel compiling? Athlon CPUs in the GHz
range alone need ~60W already when not halted. There is a whole lot of
other chips, disks, fans and voltage regulator losses. And a 100W power
supply definitely doesn't cut it, which it would if 90W were somewhere
near reality.
--
Andreas E. Bombe <andreas.bombe@munich.netsurf.de> DSA key 0x04880A44
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