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Bug 807503

Summary:	xfs contention problem
Product:	Red Hat Enterprise Linux 6	Reporter:	Vadim Tkachenko <apachephp>
Component:	kernel	Assignee:	Dave Chinner <dchinner>
Status:	CLOSED ERRATA	QA Contact:	Boris Ranto <branto>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	6.4	CC:	branto, dchinner, eguan, jcpunk, rwheeler, stephan.wiesand
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	kernel-2.6.32-328.el6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-02-21 06:05:21 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 Vadim Tkachenko 2012-03-28 01:49:26 UTC

Description of problem:

As reported in http://www.mysqlperformanceblog.com/2012/03/15/ext4-vs-xfs-on-ssd/
and
in commented
http://www.mysqlperformanceblog.com/2012/03/15/ext4-vs-xfs-on-ssd/comment-page-1/#comment-903938

There is contention problem in XFS, and the fix is available

http://oss.sgi.com/archives/xfs/2012-02/msg00219.html

Would be good to have a fix in RedHat, as it allows to gain performance 4x.

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

RedHat 6.2

Comment 2 Eric Sandeen 2012-03-28 03:54:22 UTC

Not an xfsdump bug.

Comment 3 Eric Sandeen 2012-07-06 20:09:06 UTC

FWIW, that patch is not yet upstream.  I'll leave it to Dave's judgement about when it may be ready for RHEL backport.

Comment 4 Dave Chinner 2012-07-10 03:46:31 UTC

(In reply to comment #3)
> FWIW, that patch is not yet upstream.  I'll leave it to Dave's judgement
> about when it may be ready for RHEL backport.

The patch was superceded by this series of commits:

507630b xfs: use shared ilock mode for direct IO writes by default
193aec1 xfs: push the ilock into xfs_zero_eof
f38996f xfs: reduce ilock hold times in xfs_setattr_size
467f789 xfs: reduce ilock hold times in xfs_file_aio_write_checks
b4d05e3 xfs: avoid taking the ilock unnessecarily in xfs_qm_dqattach

which have gone upstream into 3.5-rc1. I'll be backporting those....

Cheers,

Dave.

Comment 5 Eric Sandeen 2012-08-27 23:42:55 UTC

Assigning over to Dave, given the last comment.

Comment 6 RHEL Program Management 2012-09-20 20:50:48 UTC

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

Comment 7 Dave Chinner 2012-09-25 02:19:15 UTC

Posted to rhkernel-list:

http://post-office.corp.redhat.com/archives/rhkernel-list/2012-September/msg02828.html

Comment 9 Jarod Wilson 2012-10-10 20:09:14 UTC

Patch(es) available on kernel-2.6.32-328.el6

Comment 14 errata-xmlrpc 2013-02-21 06:05:21 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-0496.html