[Arm-netbook] Power Figures (Armada vs Atom)
gordan at bobich.net
Mon May 21 09:20:59 BST 2012
On 05/20/2012 06:53 PM, Dr. David Alan Gilbert wrote:
> * Gordan Bobic (gordan at bobich.net) wrote:
>> For entertainment purposes, I thought I'd share.
>> PoE with PoE->12VDC splitter, idle in both cases:
>> Advancetech Atom N450 uATX board: 18.6W
>> (occassionally trips the 30W class 3 PoE limit during POST)
>> Compulab SBC-A510, Marvell Armada 510: 9.2W
>> No contest. Granted, 9.2W is still a lot (SheevaPlug draws about 7W from
>> AC flat out), but it's still a hell of a lot better than 18.6.
> That's a good number for idle;
For Atom - maybe. For an ARM, it's pretty attrocious. My AC100 idles at
6W without CPU frequency/voltage scaling, and that includes the TFT
screen which is responsible for about half of those 6W.
> have you tried using something like
> powertop to tune them?
I did for the Atom - it is as good as it gets at 18.6W.
Haven't gotten around to it for the Armada yet.
> How about doign the same comparison when doing some comparable work
> (both say playing audio/video from approximately the same source
> and at same res)?
These are headless servers. The closest to a load test I could arrange
for is something like an in-RAM SHA512 loop.
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