Bug 463291

Summary:	[LTC 6.0 FEAT] 201279:Use 1TB segments
Product:	Red Hat Enterprise Linux 6	Reporter:	IBM Bug Proxy <bugproxy>
Component:	kernel	Assignee:	Kevin W Monroe <kmonroe>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Martin Jenner <mjenner>
Severity:	high	Docs Contact:
Priority:	high
Version:	6.0	CC:	ejratl, notting, peterm
Target Milestone:	alpha	Keywords:	FutureFeature, Reopened
Target Release:	6.0
Hardware:	ppc64
OS:	All
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-09-23 22:09:00 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	356741

Description IBM Bug Proxy 2008-09-22 20:30:58 UTC

=Comment: #0=================================================
Emily J. Ratliff <emilyr.com> - 2008-09-16 18:25 EDT
1. Feature Overview:
Feature Id:	[201279]
a. Name of Feature:	Use 1TB segments
b. Feature Description
This makes the kernel use 1TB segments for all kernel mappings and for user addresses of 1TB and
above, on machines which support them (currently POWER5+, POWER6 and PA6T).

Additional Comments:	http://www.hpcwire.com/features/17883339.html

2. Feature Details:
Sponsor:	PPC
Architectures:
ppc64

Arch Specificity: Purely Arch Specific Code
Affects Core Kernel: Yes
Delivery Mechanism: Direct from community
Category:	Performance
Request Type:	Kernel - Enhancement from IBM
d. Upstream Acceptance:	Accepted
Sponsor Priority	2
f. Severity: Medium
IBM Confidential:	no
Code Contribution:	IBM code
g. Component Version Target:	2.6.24

3. Business Case
Performance improvement and also prerequisite   for 16GB huge pages.

4. Primary contact at Red Hat: 
John Jarvis
jjarvis

5. Primary contacts at Partner:
Project Management Contact:
Michael Hohnbaum, hbaum.com, 503-578-5486

Technical contact(s):

Paul Mackerras, pmac.com

IBM Manager:
Martin Schwenke, schwenke.com

Comment 1 Bill Nottingham 2008-10-01 21:15:08 UTC

RHEL 6 will use a kernel newer than 2.6.24, so this should not be an issue.

Comment 2 Bill Nottingham 2008-10-02 02:09:25 UTC

The feature requested has already been accepted into the upstream code base
planned for the next major release of Red Hat Enterprise Linux.

When the next milestone release of Red Hat Enterprise Linux 6 is available,
please verify that the feature requested is present and functioning as
desired.

Comment 3 IBM Bug Proxy 2009-03-02 20:50:45 UTC

this is in 2.6.24
sha1 id: 1189be6508d45183013ddb82b18f4934193de274

Comment 4 Kevin W Monroe 2009-09-23 22:09:00 UTC

Closing - included in Red Hat Enterprise Linux 6.