Bug 137344 – Cannot disable hyperthreading on x86_64 platform

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Bug 137344 - Cannot disable hyperthreading on x86_64 platform

Summary:	Cannot disable hyperthreading on x86_64 platform

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 3
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	3.0
Hardware:	x86_64 Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Jim Paradis
QA Contact:	Brian Brock
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:	168424
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Reported:	2004-10-27 13:27 EDT by David Lehman
Modified:	2013-08-05 21:09 EDT (History)
CC List:	5 users (show)

See Also:
Fixed In Version:	RHSA-2006-0144
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2006-03-15 10:44:25 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2006:0144	qe-ready	SHIPPED_LIVE	Moderate: Updated kernel packages available for Red Hat Enterprise Linux 3 Update 7	2006-03-15 00:00:00 EST

Groups: None (edit)

Description David Lehman 2004-10-27 13:27:56 EDT

Description of problem:
x86_64 doesn't support disabling hyperthreading via the 'noht' kernel
option. This means that the only way to disable hyperthreading via
kernel arguments is with "acpi=off", which is known to break/disable
quite a few things and thus is not a viable alternative

Version-Release number of selected component (if applicable):
kernel-2.4.21-20.EL

How reproducible:
Always

Steps to Reproduce:
1. Boot x86_64 kernel with "noht" parameter
2. 
3.
  
Actual results:
Hyperthreading is still enabled

Expected results:
Hyperthreading is disabled

Additional info:

Comment 1 Jim Paradis 2004-10-29 01:17:49 EDT

*** Bug 137101 has been marked as a duplicate of this bug. ***

Comment 3 Jim Paradis 2004-12-03 12:26:57 EST

It should be pretty straightforward to duplicate what we do on the x86
side, modulo some differences in ACPI handling.  I see this as
perfectly doable in the U5 timeframe.

Comment 6 Eric Hagberg 2005-04-27 17:23:07 EDT

So it should be getting fixed in U5?

Comment 7 Jim Paradis 2005-04-27 17:52:22 EDT

No, this didn't make U5.  I'm testing the patch now that should be slated for U6.

Comment 16 Ernie Petrides 2005-10-20 01:42:12 EDT

A fix for this problem has just been committed to the RHEL3 U7
patch pool this evening (in kernel version 2.4.21-37.6.EL).

Comment 21 Red Hat Bugzilla 2006-03-15 10:44:25 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 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-2006-0144.html

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