[Pm-utils] powertop suggestions
Arjan van de Ven
arjan at linux.intel.com
Fri Jun 29 10:23:03 PDT 2007
Stefan Seyfried wrote:
> Holy cow, NO!
> Laptop mode kills performance badly, even the performance of a NFS mount.
do you have any real data on this?
(and I mean on JUST kernel laptop mode; not any of the other stuff the
laptop mode scripts poke at)
> And with my measurements showing that disk spindown has more psychological
> than real powersaving effects on modern laptop drives, i'd say we should
> not do it unless the users asks for "kill my performance badly for a few
> minutes more battery lifetime".
laptop mode does not spin down the disk.
laptop mode will save real power with ALPM; keeping the sata link idle
longer helps; an idle sata link saves about 1W.
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