Bug 78240

Summary:	reiserfs writes cause huge load average
Product:	[Retired] Red Hat Linux	Reporter:	Stuart Teasdale <sdt>
Component:	kernel	Assignee:	Arjan van de Ven <arjanv>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.1
Target Milestone:	---
Target Release:	---
Hardware:	athlon
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2004-09-30 15:40:13 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 Stuart Teasdale 2002-11-20 15:24:16 UTC

From Bugzilla Helper:
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Description of problem:
When writing a large file to a reiserfs partition the load average climbs
rapidly for the duration of the write, typically getting past 8 for a .5 gig
file, and blocks any other IO tasks occuring on the machine. CPU loading remains
minial according to top

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


How reproducible:
Always

Steps to Reproduce:
1.dd if=/dev/zero of=/some/reiserfs/fs/temp count=1000000
2.
3.
	

Actual Results:  Load average climbs to typically 5-10 and io tasks get blocked

Expected Results:  On a stock kernel or on a redhat kernel writing to ext2 the
load average climbs to approximately 1 and other IO tasks remain responsive.

Additional info:

The problem seems to occur with both kernel 2.4.9-31 and 2.4.18-17.7, but a
stock 2.4.19 kernel appears to show the correct behavior, as does a debian box
with  a debian standard 2.4.18 kernel.

Comment 1 Bugzilla owner 2004-09-30 15:40:13 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/