RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 807503 - xfs contention problem
Summary: xfs contention problem
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.4
Hardware: x86_64
OS: Linux
unspecified
high
Target Milestone: rc
: ---
Assignee: Dave Chinner
QA Contact: Boris Ranto
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-03-28 01:49 UTC by Vadim Tkachenko
Modified: 2013-02-21 06:05 UTC (History)
6 users (show)

Fixed In Version: kernel-2.6.32-328.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-02-21 06:05:21 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2013:0496 0 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 6 kernel update 2013-02-20 21:40:54 UTC

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