Red Hat Bugzilla – Bug 125971
[PATCH] EL3 U4: ia32e smp Kernel doesn't bringup cpus with apicid >= 8
Last modified: 2013-08-05 21:07:01 EDT
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Description of problem:
RH EL3 U2/U3 kernels doesn't bringup the secondary cpus whose apicid
is greater than 8. smpboot.c code assumes the apicid of all the
secondary processors will be less than 8.
There are some Intel MP platforms in development(4-way, 8 with HT)
which will runinto this problem. On such systems apic id's of the
processors are not sequential. And so some of the processors apciids
will be greater than 8. On such systems when we boot RHEL3 kernel, we
will see only those processors with apicid<8 after bootup. We don't
see all 8 processors up and running as desired.
This problem is fixed in 2.6 base, when ia32e support is added.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Boot EL3 on a system which as some of the processors apic id > 8
2.You will see only those processors which has apicid < 8 up and
Created attachment 101118 [details]
Patch fixing the problem
During smpboot, attached patch will now enable the kernel to kick processors
A fix for this problem has just been committed to the RHEL3 U4
patch pool this evening (in kernel version 2.4.21-20.14.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.