Red Hat Bugzilla – Bug 84013
AS 2.1 kernel hangs during boot, on generic (non-numaq) systems with more than 8 CPUs.
Last modified: 2007-11-30 17:06:52 EST
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Description of problem:
On generic (non-numaq) systems with 8 physical P4s (16 logical), AS 2.1 kernel
panic()s during boot, complaining about
"Max APIC ID exceeded!".
The system has 16 - logical processors and 4 IO-APICs.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Try booting AS 2.1 kernel on this system, the system panic()s
2.Also tried running AS 2.1 summit kernel on this system. That too fails at
the same stage.
Actual Results: panic()
Expected Results: normal boot of the system.
Created attachment 89982 [details]
Patch to support generic (non-numaq) > 8 CPU system, with summit kernel
A simple patch on AS 2.1 summit kernel boots up the above system. With this
patch summit kernel can be used to support such systems.
The patch on top of AS 2.1 summit tree is attached.
Red Hat Linux AS2.1 does not support more than 8 CPU's.
If this is a request for future products to support more than 8 CPUs, please
work with Keve Gabbert to submit through proper channels.