Bug 485428

Summary: IBM LS20/LS21 blades fail to boot RT kernel when HPET enabled in BIOS
Product: Red Hat Enterprise MRG Reporter: Clark Williams <williams>
Component: realtime-kernelAssignee: Luis Claudio R. Goncalves <lgoncalv>
Status: CLOSED ERRATA QA Contact: David Sommerseth <davids>
Severity: medium Docs Contact:
Priority: low    
Version: 1.1CC: bhu, davids, dvhltc, johnstul, ovasik, williams
Target Milestone: 1.1.1   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2009-03-27 00:15:18 UTC Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
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Description Flags
First cut at a fix for HPET boot hang none

Description Clark Williams 2009-02-13 15:28:38 UTC
Created attachment 331835 [details]
First cut at a fix for HPET boot hang

Description of problem:
If the High Precision Event Timer is enabled in the BIOS, the MRG RT kernel hangs on boot. HPET is desirable as it has less overhead than the acpi_pm timer the LS blades use currently.

Version-Release number of selected component (if applicable):
all MRG kernels

How reproducible:
Always

Steps to Reproduce:
1. Enable HPET in LS21 BIOS
2. Boot any MRG RT kernel
  
Actual results:
System hangs during boot

Additional Info:

John Stultz of IBM is looking at this and has a possible solution

Comment 1 Luis Claudio R. Goncalves 2009-02-25 20:56:41 UTC
The patches listed below were added to kenel -103 and fixed the issue:

- [time] IBM LS20/LS21 blades fail to boot with HPET enabled in BIOS [485428]
- [time] fix hpet timer reinit for x86_64

Comment 2 Luis Claudio R. Goncalves 2009-02-25 20:58:26 UTC
*** Bug 483006 has been marked as a duplicate of this bug. ***

Comment 4 David Sommerseth 2009-03-20 15:05:21 UTC
Tried to boot 2.6.24.7-101 on ls21-1.farm.hsv.redhat.com with HPET enabled in BIOS.  Failed.   Booted 2.6.24.7-107 successfully.

Comment 6 errata-xmlrpc 2009-03-27 00:15:18 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-2009-0360.html