Re: [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 3

Vojtech Pavlik
2005-08-04T15:07:26Z

On Wed, Aug 03, 2005 at 04:23:59PM +0200, Jan De Luyck wrote:
> On Wednesday 03 August 2005 14:14, Con Kolivas wrote:
> > On Wed, 3 Aug 2005 21:54, Jan De Luyck wrote:
> > > On Wednesday 03 August 2005 07:59, Con Kolivas wrote:
> > > > This is the dynamic ticks patch for i386 as written by Tony Lindgen
> > > > <tony@atomide.com> and Tuukka Tikkanen
> > > > <tuukka.tikkanen@elektrobit.com>. Patch for 2.6.13-rc5
> > >
> > > Compiles and runs ok here.
> > >
> > > Is there actually any timer frequency that's advisable to set as maximum?
> > > (in the kernel config)
> >
> > I'd recommend 1000.
>
> Thanks. Currently the system - under X, KDE, no artsd, bottoms at around
> 300HZ. In total single mode with every module unloaded that I can unload it
> stops around 22HZ.
>
> I guess I'll have to go hunting whatever thing is causing the pollings. no
> timertop yet, I guess? :P

i8042 runs a steady periodic 20Hz timer. You can make it slower to get
even the total low lower, and it will not affect performance under
normal (sane hardware) circumstances.

--
Vojtech Pavlik
SuSE Labs, SuSE CR