Bug 682612 - Rhel6 cannot support 32GB memory
Summary: Rhel6 cannot support 32GB memory
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 14
Hardware: i686
OS: Linux
unspecified
high
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-03-07 03:02 UTC by lvxueguan
Modified: 2011-03-08 07:10 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-03-08 07:10:36 UTC
Type: ---

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Description lvxueguan 2011-03-07 03:02:47 UTC 
Description of problem:
My computer has a memory of 32GB,I know rhel6 has a PAE enabled kernel by default.
but the command "free -m" only shows total memory of 16GB ,why?
Comment 1 lvxueguan 2011-03-08 01:02:06 UTC 
On fc12(kernel:2.6.32),there is a rpm package called kernel-PAE ,when the system has no PAE ,the recognized total memory is 4GB,after install kernel-PAE the recognized total memory is 32GB.
Compile kernel on rhel6(kernel:2.6.32) cannot produce package kernel-PAE,but rhel6 has a PAE enabled kernel by default,and now the recognized total memory is 16GB,why,(I know the PAE is integrated in kernel ,or the recognized total memory will be 4GB), why it is not 32GB.
Comment 2 Chuck Ebbert 2011-03-08 07:10:36 UTC 
Maximum supported memory for Red Hat Enterprise Linux 6 with the 32-bit PAE kernel is 16GB:
http://www.redhat.com/rhel/compare/

The hugemem kernel that supported more than that is no longer provided in version 5 and 6, I assume because x86_64 can support large amounts of memory much better.
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