Bug 458471

Summary:	CPU scaling not working on Intel Xeon E5335 and E5420
Product:	Red Hat Enterprise Linux 5	Reporter:	Arturas Moskvinas <artms>
Component:	kernel	Assignee:	John Villalovos <jvillalo>
Status:	CLOSED NOTABUG	QA Contact:	Red Hat Kernel QE team <kernel-qe>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.2	CC:	dzickus
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-04-24 20:13:50 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 Arturas Moskvinas 2008-08-08 17:30:28 UTC

Description of problem:
CPU scaling is not working on Intel Xeon E5335 and E5420, although both support Enhanced Intel Speedstep® Technology.
http://processorfinder.intel.com/details.aspx?sSpec=SLAEK
http://processorfinder.intel.com/details.aspx?sSpec=SLAC7
http://processorfinder.intel.com/details.aspx?sSpec=SLANV

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

How reproducible:
Everytime

Steps to Reproduce:
1. Install RHEL 5.2 
2. ls /sys/devices/system/cpu/cpu0/ | grep cpufreq
  
Actual results:
Nothing return

Expected results:
cpufreq

Additional info:
Intel Xeon E5335 is used on Intel server board S5000PAL, Intel Xeon 5345 on the same board is working correctly (CPU scaling is working).
Intel Xeon E5420 is used on Intel server board S5400SF.
Intel Xeon E5420 cpu scaling tested on kernel and kernel-xen, results are the same.

Comment 1 Arturas Moskvinas 2009-01-21 14:55:24 UTC

The issue with Intel xeon cpu E5420 frequency scaling on Intel server board S5400SF on kernel/kernel-xen was fixed with new firmware

Comment 2 John Villalovos 2009-04-24 20:13:50 UTC

Closing as no longer an issue from Comment 2