RFC: Changing default filesystem parameters for power management reasons
Matthew Garrett
mjg at redhat.com
Fri Nov 28 13:24:23 UTC 2008
On Fri, Nov 28, 2008 at 01:16:36PM +0100, Phil Knirsch wrote:
> Sounds like a great idea and something i've been working on myself
> lately, too. I even went a bit further and thought about the idea if a
> combination of a monitoring backend and a tuning engine could provide an
> automatic adoption of the system to the current use. E.g. during daytime
> when a user works with his machine we would typically see quite a few
> reads and write all the time. Drive spindowns or other power saving
> features could during that time be reduced so that the user will have
> the best performance. During the night (in case he didn't turn of the
> machine) only very few read and even fewer write operations should
> happen, at which time the disk could then be powered down most of the
> time. And of course this can be extended to not only disk drivces but
> other tunable hardware components.
Indeed. There's been a fair amount of research into this - see
http://www.soe.ucsc.edu/~tbisson/papers/bisson-fast04.pdf for instance.
Some laptop drives will behave this way if APM settings are set
appropriately, but a decent implementation of this in userspace would be
very nice.
--
Matthew Garrett | mjg59 at srcf.ucam.org
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