Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt

[Jesper Juhl]

On 7/15/05, Lee Revell <rlrevell@xxxxxxxxxxx> wrote:
> On Fri, 2005-07-15 at 02:04 +0200, Jesper Juhl wrote:
> > While reading this thread it occoured to me that perhaps what we
> > really want (besides sub HZ timers) might be for the kernel to
> > auto-tune HZ?
> >
> > Would it make sense to introduce a new config option (say
> > CONFIG_HZ_AUTO) that when selected does something like this at boot:
> >
> > if (running_on_a_laptop()) {
> >     set_HZ_to(250);
> > }
> 
> I don't think this will fly because we take a big performance hit by
> calculating HZ at runtime.
> 
Even if we only have to do it once at boot?  The thought was to detect
what type of machine we are booting on, figure out what a good HZ
would be for that type of box, then set that HZ value and treat it as
a constant from that point forward.

-- 
Jesper Juhl <jesper.juhl@xxxxxxxxx>
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