asterisk users - Oct 2005 - OT: RHEL / CentOS Enable APIC

Hello!

I'm setting up Asterisk on a new system.  In the past, all of my Asterisk 
boxes have either been embedded-style systems that do not supoort APIC, or 
multi-processor systems where APIC comes along with SMP.  However, now I'm 
trying to install Asterisk on a single CPU (and non-HT) system that does 
support APIC (A P4 Northwood an Intel 845 chipset).

I've used both RHEL3 and RHEL4 (and CentOS 3 as part of Asterisk@Home). 
For the life of me, though, I cannot seem to get an APIC enabled kernel 
installed.  It seems that because it's a uniprocessor system, the default 
is to load a uniprocessor, non-APIC kernel.  On the 2.6 kernels I've tried 
adding "lapic" as a kernel parameter, but it does not help.  I must
say
that I'm surprised that Asterisk@Home doesn't do this automatically,
given
the benefits of an APIC-enabled kernel for Asterisk.

Is there a way with either RHEL or CentOS to force it to use an 
APIC-enabled kernel?  I've tried Googling but no success.

Thank you very much for your help!

Tim Massey
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asterisk-users-bounces@lists.digium.com wrote on 10/01/2005 10:17:47 AM:
> Is there a way with either RHEL or CentOS to force it to use an 
> APIC-enabled kernel?  I've tried Googling but no success. 
I can find no way of doing this during the install.  If you have a single 
processor system, AFAIK you are stuck with standard PIC (not APIC) 
support.  And while APIC and SMP have little to do with each other any 
more, it seems that only SMP kernels have APIC support.  Therefore, you 
must install the SMP kernel.  And again, I can find no way of forcing the 
install to install an SMP kernel on a uni machine.

So, after the install takes place, you must do the following:

Mount CD #2
change into the RedHat/RPMS directory
rpm -ivh <whatever the kernel-smp.whatever.rpm is>

This will install the SMP kernel and add an entry into Grub.  If you wish 
to boot this kernel by default, modify the /boot/grub/menu.lst and change 
DEFAULT=1 to DEFAULT=0.  Then, reboot.

At this point, zaptel will not load anymore:  it will complain that it 
cannot find the module.  You will have to recompile zaptel.  After this, 
the zaptel module will load.

This works, and it doesn't seem to be too cumbersome, but it sure seems 
like there should be some sort of installation parameter you could add 
somewhere to force-load an SMP kernel even on a uniprocessor machine.  Of 
course, even better would probably be compiling a uniprocessor kernel with 
APIC support, but whatever.

Tim Massey
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