Bug 573098 - [5.4] VLAN performance issue with 10gbE Mellanox NICs
Summary: [5.4] VLAN performance issue with 10gbE Mellanox NICs
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel
Version: 5.4
Hardware: All
OS: Linux
high
high
Target Milestone: rc
: ---
Assignee: Doug Ledford
QA Contact: Red Hat Kernel QE team
URL:
Whiteboard:
Depends On: 557109
Blocks:
TreeView+ depends on / blocked
 
Reported: 2010-03-12 20:06 UTC by Doug Ledford
Modified: 2010-03-30 07:14 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of: 557109
Environment:
Last Closed: 2010-03-30 07:14:21 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2010:0178 0 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 5.5 kernel security and bug fix update 2010-03-29 12:18:21 UTC

Comment 1 RHEL Program Management 2010-03-12 20:30:56 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 5 Jarod Wilson 2010-03-17 15:53:31 UTC
in kernel-2.6.18-194.el5
You can download this test kernel from http://people.redhat.com/jwilson/el5

Please update the appropriate value in the Verified field
(cf_verified) to indicate this fix has been successfully
verified. Include a comment with verification details.

Comment 7 John Jarvis 2010-03-19 14:39:11 UTC
Can we please get the BZ updated with some steps to reproduce the problem?

Comment 8 James M. Leddy 2010-03-19 14:49:36 UTC
(In reply to comment #7)
> Can we please get the BZ updated with some steps to reproduce the problem?    

1. Find a mlx4 nic
2. Test the speed of the connection, using netperf. v_1
3. Set up a private vlan on the mlx4 card.
4. Test the speed of vlan, using netperf. v_2

You'll see that when using vlans, the throughput of the connection is about %85 slower. With the patch this is a reduction of %15 or something similar. You should be getting close to line speed without the vlan on top.

Comment 11 errata-xmlrpc 2010-03-30 07:14:21 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-2010-0178.html


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