Bug 483535

Summary: RHEL4 kvm virtio: kernel driver updates
Product: Red Hat Enterprise Linux 4 Reporter: Chris Lalancette <clalance>
Component: kernelAssignee: Chris Lalancette <clalance>
Status: CLOSED ERRATA QA Contact: Martin Jenner <mjenner>
Severity: medium Docs Contact:
Priority: low    
Version: 4.8CC: xen-maint
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2009-05-18 19:35:48 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:
Bug Depends On:    
Bug Blocks: 446215    
Attachments:
Description Flags
Patch to allow MTU to be changed
none
Patch to let RHEL-4 use TSO offload none

Description Chris Lalancette 2009-02-02 09:10:16 UTC 
There are a couple of updates that we need for the RHEL-4 virtio network drivers.  At present, they are:

1)  TSO offload; this should reduce CPU usage on the host machine by offloading checksumming until the last possible moment.

2)  MTU change; this will allow the guest to send > 1500 byte packets out over the network.

I'll attach patches for both of these once I have them cleaned up and tested.
Comment 1 Chris Lalancette 2009-02-02 09:56:48 UTC 
Created attachment 330607 [details]
Patch to allow MTU to be changed
Comment 2 Chris Lalancette 2009-02-02 09:57:41 UTC 
Created attachment 330608 [details]
Patch to let RHEL-4 use TSO offload
Comment 3 RHEL Program Management 2009-02-03 03:38:24 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 Chris Lalancette 2009-02-10 09:56:59 UTC 
Comment on attachment 330608 [details]
Patch to let RHEL-4 use TSO offload

I've obsoleted the TSO patch for now.  In testing, I couldn't make out a discernible difference between a kernel with the TSO patch and one without.  So unless/until we can show an improvement in behavior, leave it out.
Comment 5 Vivek Goyal 2009-02-12 15:35:44 UTC 
Committed in 81.EL . RPMS are available at http://people.redhat.com/vgoyal/rhel4/
Comment 8 errata-xmlrpc 2009-05-18 19:35:48 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-2009-1024.html