Bug 75117

Summary:	(FS PROC)System idle time in /proc/stat does not match CPU idle time
Product:	[Retired] Red Hat Linux	Reporter:	Lev Makhlis <lev_makhlis>
Component:	kernel	Assignee:	Arjan van de Ven <arjanv>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	8.0
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2004-09-30 15:40:00 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 Lev Makhlis 2002-10-04 16:54:38 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (compatible; Konqueror/3.0.0-10; Linux)

Description of problem:
The idle time in the "cpu" line (which is supposed to be the sum of all individual CPUs) often differs by 10-20 ms (i.e., 1-2 userspace ticks) from the idle time in the "cpu0" line on a single-processor system.

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


How reproducible:
Sometimes

Steps to Reproduce:
1. grep cpu /proc/stat

 

Actual Results:  cpu  513891 3024 68072 12500724
cpu0 513891 3024 68072 12500722


Expected Results:  Identical numbers

Additional info:

This is a round-off problem.  When the total idle time is calculated,
the hz_to_std() conversion is applied to user, nice and system times
separately, while for an individual CPU, the conversion is applied to the sum.

Comment 1 Bugzilla owner 2004-09-30 15:40:00 UTC

Thanks for the bug report. However, Red Hat no longer maintains this version of
the product. Please upgrade to the latest version and open a new bug if the problem
persists.

The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases, 
and if you believe this bug is interesting to them, please report the problem in
the bug tracker at: http://bugzilla.fedora.us/