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 682831 - Bad ext4 sync performance on 16 TB GPT partition
Summary: Bad ext4 sync performance on 16 TB GPT partition
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.0
Hardware: x86_64
OS: Linux
medium
high
Target Milestone: rc
: ---
Assignee: Eric Sandeen
QA Contact: Eryu Guan
URL:
Whiteboard:
Depends On: 572930
Blocks: 1020728
TreeView+ depends on / blocked
 
Reported: 2011-03-07 17:50 UTC by Debbie Johnson
Modified: 2018-11-14 14:09 UTC (History)
13 users (show)

Fixed In Version: kernel-2.6.32-128.el6
Doc Type: Bug Fix
Doc Text:
Clone Of: 572930
: 1020728 (view as bug list)
Environment:
Last Closed: 2011-05-23 20:43:06 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2011:0542 0 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 6.1 kernel security, bug fix and enhancement update 2011-05-19 11:58:07 UTC

Comment 2 RHEL Program Management 2011-03-07 18:40:36 UTC 
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 4 Aristeu Rozanski 2011-03-30 14:32:19 UTC 
Patch(es) available on kernel-2.6.32-128.el6
Comment 8 Eryu Guan 2011-04-06 12:33:57 UTC 
The difference is not so big, but it does improve the sync performance from my testing. Set it to VERIFIED

On -71 kernel
[root@ibm-x3550m3-02 scratch]# /usr/bin/time bash -c "dd if=/dev/zero of=bigfile bs=1M count=10000 && sync"
10000+0 records in
10000+0 records out
10485760000 bytes (10 GB) copied, 90.0757 s, 116 MB/s
0.00user 22.23system 1:31.04elapsed 24%CPU (0avgtext+0avgdata 7312maxresident)k
744inputs+286130176outputs (1major+1053minor)pagefaults 0swaps

On -128 kernel
[root@ibm-x3550m3-02 scratch]# /usr/bin/time bash -c "dd if=/dev/zero of=bigfile bs=1M count=10000 && sync"
10000+0 records in
10000+0 records out
10485760000 bytes (10 GB) copied, 64.9366 s, 161 MB/s
0.00user 9.14system 1:24.04elapsed 10%CPU (0avgtext+0avgdata 7296maxresident)k
56inputs+20480000outputs (1major+1055minor)pagefaults 0swaps

Multiple runs always showed about 5 seconds improvement. 

The testing environment is a ibm-x3550 host with 16G memory and 16 cores, on a 200G ext4 partition.
[root@ibm-x3550m3-02 ~]# free -m
             total       used       free     shared    buffers     cached
Mem:         15940        441      15498          0          0         10
-/+ buffers/cache:        430      15509
Swap:            0          0          0
[root@ibm-x3550m3-02 ~]# grep -c proc /proc/cpuinfo 
16
[root@ibm-x3550m3-02 scratch]# mount | grep scratch
/dev/mapper/vg_ibmx3550m302-test on /mnt/scratch type ext4 (rw)
Comment 9 errata-xmlrpc 2011-05-23 20:43:06 UTC 
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 therefore 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/RHSA-2011-0542.html
Note You need to log in before you can comment on or make changes to this bug.