Bug 222921

Summary:	On Greyhound CPUs, the 2.4.21-40.EL #1 SMP kernel appears to drive the 100HZ timer interrupts with NMIs
Product:	Red Hat Enterprise Linux 3	Reporter:	Jim Mattson <jmattson>
Component:	kernel	Assignee:	Red Hat Kernel Manager <kernel-mgr>
Status:	CLOSED WONTFIX	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	3.7
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-10-19 18:39:10 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:

Description Jim Mattson 2007-01-16 21:22:17 UTC

Description of problem:
On AMD Greyhound (aka K8L) CPUs, timer interrupts are driven with NMIs,
resulting in degraded performance.

Version-Release number of selected component (if applicable): 2.4.21-40.EL #1 SMP


How reproducible: 100%


Steps to Reproduce:
1. Boot RHEL3 Update 7 on a Greyhound CPU, using the stock SMP kernel
2. Observe total NMI interrupts with 'cat /proc/cpuinfo'
  
Actual results:

NMIs are delivered at 100HZ.

Expected results:

NMIs should occur only infrequently.

Additional info:

Comment 1 RHEL Program Management 2007-10-19 18:39:10 UTC

This bug is filed against RHEL 3, which is in maintenance phase.
During the maintenance phase, only security errata and select mission
critical bug fixes will be released for enterprise products. Since
this bug does not meet that criteria, it is now being closed.
 
For more information of the RHEL errata support policy, please visit:
http://www.redhat.com/security/updates/errata/
 
If you feel this bug is indeed mission critical, please contact your
support representative. You may be asked to provide detailed
information on how this bug is affecting you.