Messages in this thread | | | Date | Thu, 05 Jul 2007 12:58:58 -0700 | From | Arjan van de Ven <> | Subject | Liunx power consumption on laptops -- Enormous progress in the last few months |
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Hi,
with all the tickless and other goodies going into the kernel in the last few months, there is a lot of hope that this helps Linux reduce power consumption... and the good news is that it does... once you fix some bugs and fix a bunch of userspace applications.
While it's hard to show "one size fits all" number/percentage, we took a bog standard Lenovo T61 laptop (no vendor preference, they just were the first one to deliver a model with the latest Intel chipset to our cubes) and measured the effect. The baseline we used was a 32 bit Fedora 7 installation; note that this already has the tickless kernel, but is lacking several of the key bugfixes that came afterwards.
We've put our measurements in a graph at
http://ww.linuxpowertop.org/results.php
With kernel fixes and features, the power consumption of this laptop went from 21.06 Watts to 18.25 Watts; with 2 additional userspace fixes the power consumption ended up at 15.5 Watts.
(Don't worry that this is the end of it; there's more stuff in the various project pipelines, and we'll keep measuring the progress over time)
All in all, personally I'm very happy to see Linux making such a huge step forward with tickless and can't wait for this step to be available in all distros and for all architectures...
Greetings, Arjan van de Ven - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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