CPU Frequency Scaling and Niceness

Evan eapache at gmail.com
Mon Apr 27 21:24:32 UTC 2009

Reposting to full list. Sorry Felipe.
On Mon, Apr 27, 2009 at 5:05 PM, Felipe Figueiredo <philsf79 at gmail.com>wrote:

> Evan wrote:
> > I just updated to from Intrepid to Jaunty, and I noticed something
> > curious. I believe this is a bug, but even if it isn't, I thought it
> > should be raised.
> >
> > If a cpu (or core) is set to "Ondemand" and an application with a high
> > nice value is running:
> > - In intrepid, the cpu remained scaled down
> > - In jaunty the cpu scales up to 100%
> Why do you think it is a bug? I would guess the intrepid scaling
> governor was too strict instead.
>  The nice behaviour AIUI is that the nice process is slowed/halted until
> the CPU is available, but as soon as it is, it should be used, shouldn't
> it?

The bug is more that even when I set ignore_nice_load to 1 manually, it
still doesn't do it.

Unless there is something else which is supposed to be overriding that
setting, this is a bug.
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