Re: [Xenomai-help] POSIX skin or CONFIG_XENO_OPT_PERVASIVE disabled

[Leopold Palomo-Avellaneda <lepalom@domain.hid>]

A Dimarts 25 Setembre 2007 11:11, Gilles Chanteperdrix va escriure:
> On 9/25/07, Leopold Palomo-Avellaneda <lepalom@domain.hid> wrote:
> > A Dimarts 25 Setembre 2007 10:52, Gilles Chanteperdrix va escriure:
> > > On 9/25/07, juergen.lanner@domain.hid <juergen.lanner@domain.hid> wrote:
> > > > Hello Gilles!
> > > >
> > > >  Thank you very much for your reponse.
> > > >
> > > >  LAPIC is disabled in BIOS, so "make menuconfig" does not even give
> > > > me the possibility to change it at all. in the .config file I could
> > > > find CONFIG_X86_LOCAL_APIC=y.
> > > >  I f I set it to =n and start "make menuconfig" again, it resets it
> > > > to y even if I do not change anything manually.
> > >
> > > The reason why make menuconfig does not let you change the LAPIC
> > > setting is that you selected the "SMP" option. Since your box only has
> > > one CPU, you should disable SMP. Then you will be able to enable or
> > > disable the local APIC. Note that if your box has an APIC, using it
> > > gives better performances.
> >
> > I have a cpu with multicore (the kernel see 2 cpus) but it's _only_
> > physically one cpu. What I have to choose in the config, smp yes or not?
>
> Yes, of course, the advice was for juergen, whose kernel only sees one cpu.

Ok, thanks.

my box has the problem that I have to disable the apic (noapic) at boot time 
because of the machine hangs at random. So, after your email, I lost a lot of 
performance?

Regards,

Leo