Bug 553324

Summary: [RHEL5 Xen]: Cpu frequency scaling is broken on Intel
Product: Red Hat Enterprise Linux 5 Reporter: Chris Lalancette <clalance>
Component: kernel-xenAssignee: Chris Lalancette <clalance>
Status: CLOSED ERRATA QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: medium Docs Contact:
Priority: low    
Version: 5.4CC: emcnabb, mjenner, xen-maint
Target Milestone: rcKeywords: Regression
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Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2010-03-30 07:40:58 UTC Type: ---
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Fix frequency scaling on Intel none

Description Chris Lalancette 2010-01-07 16:05:33 UTC 
Description of problem:
The patch for BZ 502826 broke frequency scaling on Intel platforms.  The reason for this is because it masked out the EST bit from dom0, which is necessary for frequency scaling to work properly.  I'll attach a simple patch to revert just that change which seems to fix the problem in my testing.
Comment 1 Chris Lalancette 2010-01-07 16:08:21 UTC 
Created attachment 382276 [details]
Fix frequency scaling on Intel
Comment 11 errata-xmlrpc 2010-03-30 07:40:58 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 therefore 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-2010-0178.html