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Description of problem:
As per : https://bugzilla.redhat.com/show_bug.cgi?id=184820

In RHEL5, shmmax and shmall were set to the theoretical limit of the architecture, which for x86_64 was 64G and 4G respectively. RHEL6 doesn't have these set.

Version-Release number of selected component (if applicable):

initscripts-9.03.17-1.el6.x86_64

How reproducible:

Always

Steps to Reproduce:
1. Compare /etc/sysctl.conf in RHEL5 and RHEL6

  
Actual results:
shmmax and shmall reverts back to the defaults set in RHEL3/4

Expected results:
shmmax and shmall should be set the same way it was done in RHEL5

Additional info:

If it was intentionally reverted, I couldn't find the reasons to do so.

It wasn't really an intentional change; it was a RHEL 5 change that we forgot to pull forward. CC'ing some more people for discussion of the impact.

Created attachment 476993 [details]
set default shmmax and shmall for certain architectures

This patch is adapted from RHEL-5 branch (http://git.fedorahosted.org/git/?p=initscripts.git;a=commit;h=00b168f895a662adb0cecb12e8d619778f35f633)

An advisory 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 therefore 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.

http://rhn.redhat.com/errata/RHBA-2011-0647.html