Re: RHEL4 smp hangs at boot

[Jay Turner <jkt redhat com>]

On Tue, Oct 25, 2005 at 05:49:58PM -0700, Mark Ortmeyer wrote:
> We have recently purchased a dual Xeon processor machine and are trying 
> to install RHEL4 smp onto it.
> 
> Unfortunately, the machine hangs during boot when the smp option is
> selected.  I was able to get the machine configured using the single
> processor kernel, however...  Machine hangs before syslog kicks in so we
> have little diagnostic information.  Poking around however, I found this
> and am wondering if this calls for a kernel recompile:
> 
> WARNING: NR_CPUS limit of 1 reached. Processor ignored.

This is expected since it's a UP kernel booting on an SMP machine.
Basically just saying, "I found all the processors that I know how to deal
with, ignoring the rest."

> 
> Does anyone have any idea why the machine would hang after selecting the 
> smp option?

Grabbing a dump of the SMP boot process would be good.  Might also want to
try booting with "linux acpi=off"

- jkt
-- 
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Jay Turner, QE Technical Lead      jkt redhat com             Red Hat, Inc. 

          If A equals success, then the formula is: A = X + Y + Z, 
     X is work. Y is play. Z is keep your mouth shut. - Albert Einstein