Re: Increasing HZ (patch for HZ > 1000)

Vojtech Pavlik
2003-12-13T08:37:00Z

On Fri, Dec 12, 2003 at 11:45:23PM +0000, Jamie Lokier wrote:
> Vojtech Pavlik wrote:
> > > > I'd advocate lower HZ. Say, oh I dunno...100? This is better for power
> > > > management and also should make the sound go away.
> > >
> > > Alas, the sound my Toshiba laptop makes when the CPU is busy is the
> > > same frequency whatever kernel, and by extension whatever the timer
> > > frequency. I guess it must have another cause :/
> >
> > If it's when the CPU is busy, then it's the CPU's DC/DC converter. There
> > is no way to get rid of the noise without mnodifying the notebook.
>
> It only does it when the CPU is busy in any low power mode. In
> maximum power mode it never makes the noise. It sounds like it's
> coming from the speakers (independent of volume control though), but
> it might not be.
>
> Would the DC/DC converter noise be explained by a low quality
> capacitor used by the converter?

Yes.

--
Vojtech Pavlik
SuSE Labs, SuSE CR