Bug 167412

Summary:	[RFC] [RHEL4 U2 patch] dual-core detection gap for i386 build
Product:	Red Hat Enterprise Linux 4	Reporter:	Linda Wang <lwang>
Component:	kernel	Assignee:	Jim Paradis <jparadis>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.0	CC:	jbaron, peterm
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
Whiteboard:
Fixed In Version:	RHSA-2005-514	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-10-05 13:55:28 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:	156323

Description Linda Wang 2005-09-02 14:11:52 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050512 Red Hat/1.0.4-1.4.1 Firefox/1.0.4

Description of problem:
The patch Intel submitted for dual-core detection wasn't included quite as it was submitted. As a result, on i386 the conditions for when certain multi-thread/multi-core fields appear in /proc/cpuinfo are different than on x86_64.

One of these differences Intel feels is a critical regression from U1. That is, on a system without HT, the "physical id" and "siblings" fields will not be displayed. These are already being used for licensing and cpu affinity purposes in the field (e.g. BZ 147674), so Intel does not want to see a regression on this. 

The second hunk of the patch addresses another inconsistency between the i386 and x86_64 paths in your tree which is not present upstream, but is not absolutely required if that will change your mind. (The bug makes the sibling count incorrect when HT is disabled.) 

Version-Release number of selected component (if applicable):
kernel-2.6.9

How reproducible:
Always

Steps to Reproduce:
1.install RHEL4U2
2.boot the system up
3.cat /proc/cpuinfo
  

Actual Results:  multi-thread/multi-core fields appear in /proc/cpuinfo are different than on x86_64

Expected Results:  multi-thread/multi-core fields appear in /proc/cpuinfo should be the same on x86_64

Additional info:

Comment 10 Red Hat Bugzilla 2005-10-05 13:55:28 UTC

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 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.

http://rhn.redhat.com/errata/RHSA-2005-514.html