[Pm-utils] powertop suggestions

[Arjan van de Ven]

Richard Hughes wrote:
> On Wed, 2007-06-27 at 13:37 -0700, Arjan van de Ven wrote:
>> Richard Hughes wrote:
>>> When using powertop I'm told to do:
>>>
>>> echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
>> that is mostly because fedora sets it to 30 (300ms) on AC (which is 
>> insanely short)
> 
> What are the ideal values for this on AC and battery?
> 
>>> echo 5 > /proc/sys/vm/laptop_mode
>> this probably just wants to be done always, regardless of AC/battery
> 
> Can this default just be changed in the kernel?
> 
>>> mount -o remount,noatime /
>> noatime has some sideeffects; there are various forms of "less atime" 
>> that are more benign
> 
> Any ideas on how to enable less-atime? :-)
> 

there is lazyatime, which is sort of a best of both worlds; it updates 
atime, but only when it really matters