Re: Powersaving Patch for NetworkManager

["James M. Leddy" <jleddy redhat com>]

drago01 wrote:
> On Wed, Nov 26, 2008 at 1:59 PM, Alexander Sack <asac ubuntu com> wrote:
> > On Tue, Nov 25, 2008 at 01:38:12PM +0100, Jan Kantert wrote:
> > > Hi,
> > >
> > > according to powertop Network Manager wakes up my cpu about once every
> > > two seconds. Thats does not sound much but on an idle desktop with 10
> > > wake ups per seconds thats 5%. I wanted my laptop's cpu to stay longer
> > > in sleepstates so I wrote a little patch (against trunk) to replace
> > > g_timeout_add with g_timeout_add_seconds (where possible), which uses
> > > more rough granularity. This helps to aggregate timeouts and will
> > > statistically wake up the cpu less frequently.
> > Sounds good. Curious, if you have collected data on how much of a
> > powersaving win this patch brings?
>
> The patch itself won't save much power, but when other apps wake up
> less often too the cpu will spend more time idle and therefore save
> power.

?? - we should be able to quantify with powertop.  Even if it doesn't 
save much power in the long run a wakeup once every 2 secconds (as 
quoted) vs. a wakeup once every 10 is an %80 reduction in wakeups.