Bug 596385

Summary: implement dev_disable_lro for RHEL5 [rhel-5.5.z]
Product: Red Hat Enterprise Linux 5 Reporter: RHEL Program Management <pm-rhel>
Component: kernelAssignee: Jiri Pirko <jpirko>
Status: CLOSED ERRATA QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: high Docs Contact:
Priority: high    
Version: 5.6CC: apevec, dhoward, eguan, jpirko, jwest, nhorman, noc, ovirt-maint, pasik, pm-eus, rkhan, sgzijl
Target Milestone: rcKeywords: ZStream
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Large-Receive Offload (LRO) is a performance optimization that enables the kernel to fetch and process, as a unit, more than one received packet from a network device. It was previously not possible to dynamically disable LRO for devices in a forwanding mode. This has been fixed with this update so that the kernel is able to dynamically disable LRO for devices in a forwarding state, or which had had LRO turned on manually.
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-07-01 18:29:43 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 582367    
Bug Blocks: 619915    

Description RHEL Program Management 2010-05-26 17:15:44 UTC
This bug has been copied from bug #582367 and has been proposed
to be backported to 5.5 z-stream (EUS).

Comment 3 Jiri Pirko 2010-06-07 13:31:23 UTC
in 2.6.18-194.6.1.el5

Comment 6 Neil Horman 2010-06-28 11:09:14 UTC
You should be able to force LRO off for various drivers by adding them to a bridge interface.  Detecting if it works will ususaly require you to look in the message log for various informational driver messages about lro being disabled.

Comment 9 Douglas Silas 2010-06-28 20:27:22 UTC
Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.

New Contents:
Large-Receive Offload (LRO) is a performance optimization that enables the kernel to fetch and process, as a unit, more than one received packet from a network device. It was previously not possible to dynamically disable LRO for devices in a forwanding mode. This has been fixed with this update so that the kernel is able to dynamically disable LRO for devices in a forwarding state, or which had had LRO turned on manually.

Comment 11 errata-xmlrpc 2010-07-01 18:29:43 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-2010-0504.html