Bug 394581 – Enforce report_lost_ticks boot time parameter in time.c

Bug 394581 - Enforce report_lost_ticks boot time parameter in time.c

Summary:	Enforce report_lost_ticks boot time parameter in time.c

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 5
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	5.1
Hardware:	x86_64 Linux

Priority	low Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Prarit Bhargava
QA Contact:	Martin Jenner
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2007-11-21 11:47 EST by John Sobecki
Modified:	2008-05-21 11:02 EDT (History)
CC List:	3 users (show)

See Also:
Fixed In Version:	RHBA-2008-0314
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2008-05-21 11:02:14 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
enforce report_lost_ticks (793 bytes, text/x-patch) 2007-11-21 11:47 EST, John Sobecki	no flags	Details
RHEL5 fix for this issue (1.18 KB, patch) 2007-11-27 13:48 EST, Prarit Bhargava	no flags	Details \| Diff
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description John Sobecki 2007-11-21 11:47:49 EST

Description of problem:

During high database load testing (Oracle OLT) the kernel issues both of
these lost tick related warning messages:

1) kernel: warning: many lost ticks.
   kernel: Your time source seems to be instable or some driver is 
           hogging interupts

2)  kernel: Losing some ticks... checking if CPU frequency changed.

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

2.6.18.*

How reproducible:

Under large Oracle OLT load testing, with 1000+ processes, this can
be reproduced 100% of the time. 

Steps to Reproduce:
1. Create Oracle DB
2. Load OLT test kit (available at htto://oss.oracle.com/projects/olt)
3. Run large load with 1000+ processes
  
Actual results:

Machine will slow and kick out multiple lost ticks messages.
Expected results:

Only print lost ticks messages if booted with 'report_lost_ticks'.

Additional info:

Customer noticed this after they switched from SLES9 to RHEL5; in SLES9
there is only one place where lost ticks warnings are printed, and it
includes an if (report_lost_ticks) check before the code block.

Comment 1 John Sobecki 2007-11-21 11:47:49 EST

Created attachment 266131 [details]
enforce report_lost_ticks

Comment 4 Prarit Bhargava 2007-11-27 13:48:50 EST

Created attachment 270051 [details]
RHEL5 fix for this issue

Updated patch.

Comment 5 RHEL Product and Program Management 2007-12-05 19:15:33 EST

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 7 Don Zickus 2007-12-17 14:37:42 EST

in 2.6.18-61.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 10 errata-xmlrpc 2008-05-21 11:02:14 EDT

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 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.

http://rhn.redhat.com/errata/RHBA-2008-0314.html

Note You need to log in before you can comment on or make changes to this bug.