Bug 115061 - [PATCH] rhel 2.1 will need to pick up the cyclone-lpj-fix
[PATCH] rhel 2.1 will need to pick up the cyclone-lpj-fix
Product: Red Hat Enterprise Linux 2.1
Classification: Red Hat
Component: kernel (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Jason Baron
Brian Brock
Depends On:
Blocks: 107565
  Show dependency treegraph
Reported: 2004-02-05 18:05 EST by john stultz
Modified: 2013-03-06 00:56 EST (History)
4 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2004-04-21 21:02:54 EDT
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Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
linux-2.4.23-pre9_cyclone-lpj-fix_A0.patch (906 bytes, patch)
2004-02-05 18:07 EST, john stultz
no flags Details | Diff

  None (edit)
Description john stultz 2004-02-05 18:05:38 EST
From Bugzilla Helper: 
User-Agent: Mozilla/5.0 (compatible; Konqueror/3.2; Linux) (KHTML, 
like Gecko) 
Description of problem: 
This is a clone for RHEL 2.1 of bug #110170  
I've opened it separately so this issue is tracked for both 
Hardware Environment:   
x440 and x445   
Software Environment:   
Distros based on kernels < 2.4.23 
Version-Release number of selected component (if applicable): 
How reproducible: 
Steps to Reproduce: 
1. Boot RHEL 2.1 
2. Observe the BogoMIPS rating given to each cpu  
Actual Results:  Occasionally we'll see something like:  
        Calibrating delay loop... 3.27 BogoMIPS  
Expected Results:  Always seeing something like:  
        Calibrating delay loop... 199.47 BogoMIPS  
Additional info: 
This issue is caused by the lost-tick compensation code in the 2.4 
kernel using loops_per_jiffy before that value is calculated. This 
can cause loops_per_jiffy to be miscalculated, which may cause SCSI 
hangs at boot, occasional keyboard and mouse hangs in X, time 
running too fast, as well as other unseen issues. Normally the 
problem only occurs if the last cpu booted mis-calculates 
loops_per_jiffy, so it seems to show up rarely.   
The fix is to apply the patch submitted to lkml (now in 2.4.23-rc1) 
seen here: 
Here is the patch included into 2.4.23-rc1As a side note, this 
problem was found while testing SLES8, so it has been fixed and does 
not affect SuSE
Comment 1 john stultz 2004-02-05 18:07:21 EST
Created attachment 97505 [details]
Comment 3 Jason Baron 2004-02-23 14:39:31 EST
i've commit it to the U4 update stream for summit
Comment 5 Jason Baron 2004-02-27 17:00:47 EST
patch included in U4 erratum candidate
Comment 6 john stultz 2004-03-26 16:33:01 EST
Tested the 2.4.9-e39summit kernel on an x440 and the issue seems to 
be resolved. BogoMIPS was correct on all cpus. This looks to be 
closable now.  
Comment 7 John Flanagan 2004-04-21 21:02:55 EDT
An errata 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.


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