[Xen-devel] Re: [RFC PATCH 01/35] Add XEN config options and disable unsupported config options.

[Ed Tomlinson <edt@xxxxxx>]

On Tuesday 09 May 2006 06:05, Adrian Bunk wrote:
> On Tue, May 09, 2006 at 12:00:01AM -0700, Chris Wright wrote:
> >...
> > --- linus-2.6.orig/arch/i386/Kconfig
> > +++ linus-2.6/arch/i386/Kconfig
> >...
> >  config X86_IO_APIC
> >     bool
> > -   depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER))
> > +   depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER || 
> > X86_XEN))
> >     default y
> >...
> 
> <nitpick>not required</nitpick>
> 
> > --- linus-2.6.orig/kernel/Kconfig.hz
> > +++ linus-2.6/kernel/Kconfig.hz
> > @@ -3,7 +3,7 @@
> >  #
> >  
> >  choice
> > -   prompt "Timer frequency"
> > +   prompt "Timer frequency" if !XEN
> >     default HZ_250
> >     help
> >      Allows the configuration of the timer frequency. It is customary
> > @@ -40,7 +40,7 @@ endchoice
> >  
> >  config HZ
> >     int
> > -   default 100 if HZ_100
> > +   default 100 if HZ_100 || XEN
> >     default 250 if HZ_250
> >     default 1000 if HZ_1000
> >...
> 
> Why?

Guessing, but its probably to limit the number of parahypervisor calls.

Ed Tomlinson

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