Re: [PATCH] Work around for periodic do_gettimeofday hang

[Arjan van de Ven]

On Wed, 2004-11-24 at 20:33 -0800, Andrew Morton wrote:
> James Bottomley <James.Bottomley@xxxxxxxxxxxx> wrote:
> >
> >  +config X86_HZ
> >  +       int "Clock Tick Rate"
> >  +       default 1000 if !(M386 || M486 || M586 || M586TSC || M586MMX)	
> >  +       default 100 if (M386 || M486 || M586 || M586TSC || M586MMX)	
> >  +       help
> >  +	  Select the kernel clock tick rate in interrupts per second.
> >  +	  Slower processors should choose 100; everything else 1000.
> 
> I guess we don't need the help, given that it's not a menuisable option. 
> (There was a make-HZ-selectable patch once, and Linus spat it out).

I'd rather have it as menu-visible option, but I can see how arbitrary
HZ gets spat out. How about a radio-button like thing with "100" and
"1000" in it.

HZ=1000 costs you 1% HPC performance, and for slower machines probably more. Also some hw (with slow smm) really doesn't likeit.

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