Update on DeviceKit

[Matthew Garrett]

On Thu, May 08, 2008 at 04:50:31PM +0200, Holger Macht wrote:

> Hey, it's just an abstract interface. Every system, architecture or
> distribution can do whatever they want behind the interface. It's just an
> "the higher the value, the higher the performance, the higher the power
> consumption". And that's generally true.

Right, but what are you changing? Limiting the maximum frequency to 
anything other than the hardware maximum wastes power (and prevents you 
from getting at Intel's dynamic acceleration stuff). Changing the 
governor to anything other than ondemand wastes power. With enough 
understanding of the workload, you could play with the threshold values 
- but that also requires knowledge of the hardware, and so making that 
decision requires exposing enough information to the application that a 
simple 0-100 scale doesn't make any sense.

Really. You can't provide any useful interface to the hardware in this 
way.

-- 
Matthew Garrett | mjg59 at srcf.ucam.org