Red Hat Bugzilla – Bug 129302
MAX_IO_APICS increase to 16
Last modified: 2013-08-05 21:07:01 EDT
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Description of problem:
We are shipping Opteron systems which will enter Alpha with marquee
customers very soon. They will be running AMD64 RHAS3 in the alpha
Our systems require >8 IOAPICs to function. The suggested change to
the RHEL kernel is to increase MAX_IO_APICS to 16 in file include/asm-
This change has been made in the 2.4.26 x86_64 kernel on kernel.org
and is also in 2.6.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Boot a system with >8 IOAPICs (such as Fabric7 systems).
Our Alpha/Beta sites include members of RedHat's customer base on
Other parties have requested that this be bumped to 32, so that is
what we'll do.
A fix for this problem has just been committed to the RHEL3 U4
patch pool this evening (in kernel version 2.4.21-20.4.EL).
An errata has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.