Bug 455504 - Backport of don't use large pages to map the first 2/4MB of memory form 2.6.26 to RHEL5-U3
Backport of don't use large pages to map the first 2/4MB of memory form 2.6.2...
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel (Show other bugs)
5.3
i386 Linux
medium Severity medium
: rc
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Assigned To: Larry Woodman
Martin Jenner
:
Depends On:
Blocks: 455409
  Show dependency treegraph
 
Reported: 2008-07-15 15:26 EDT by Larry Woodman
Modified: 2009-01-20 15:15 EST (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2009-01-20 15:15:53 EST
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
Patch to use 4KB pages for first 2MB of kernel space. (968 bytes, patch)
2008-07-15 15:26 EDT, Larry Woodman
no flags Details | Diff

  None (edit)
Description Larry Woodman 2008-07-15 15:26:47 EDT
Description of problem:

Intel recommends to not use large pages for the first 1MB
of the physical memory because there are fixed size MTRRs there
which cause splitups in the TLBs.

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

RHEL5-U3

How reproducible:

N/A

Steps to Reproduce:
1.
2.
3.
  
Actual results:

Using 2MB pages for first 2MB of kernel memory

Expected results:

Use 4KB pages for first 2MB of kernel memory.

Additional info:
Comment 1 Larry Woodman 2008-07-15 15:26:47 EDT
Created attachment 311875 [details]
Patch to use 4KB pages for first 2MB of kernel space.
Comment 3 RHEL Product and Program Management 2008-07-31 15:02:21 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.
Comment 4 Don Zickus 2008-09-09 17:16:38 EDT
in kernel-2.6.18-109.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5
Comment 8 errata-xmlrpc 2009-01-20 15:15:53 EST
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/RHSA-2009-0225.html

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