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 555693 - [LTC 6.0 FEAT] KVM network performance: vhost-net patches
Summary: [LTC 6.0 FEAT] KVM network performance: vhost-net patches
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.0
Hardware: other
OS: All
low
high
Target Milestone: beta
: 6.0
Assignee: Steve Best
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 356741 532696
TreeView+ depends on / blocked
 
Reported: 2010-01-15 08:20 UTC by IBM Bug Proxy
Modified: 2023-09-14 01:19 UTC (History)
10 users (show)

Fixed In Version: kernel-2.6.32
Doc Type: Enhancement
Doc Text:
Clone Of:
Environment:
Last Closed: 2010-07-02 19:19:29 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
IBM Linux Technology Center 58969 0 None None None Never

Description IBM Bug Proxy 2010-01-15 08:20:41 UTC 
=Comment: #0=================================================
Sridhar Samudrala <sri.com> - 
+++ This bug was initially created as a clone of Bug #57507 +++

1. Feature Overview:
Feature Id:	[202045]
a. Name of Feature:	vhost-net  and  vm network performance
b. Feature Description
vhost-net patchset : add  tap and raw socket backend support to host kernel to improve network latency
 udp fragmentation offload: improve throughput of guest-host/guest-guest by enabling UFO to
send/receive large UDP packets 
 - virtio-net performance enhancement : avoid unnecessary skb allocs/frees for large packet in guest
receive path by deferring skb allocations
 IGMP Snooping - to briding code to improve multicast performnace when using a bridge to connect
multiple guests.

2. Feature Details:
Sponsor:	LTC
Architectures:
x86
x86_64

Arch Specificity: Both
Affects Kernel Modules: Yes
Delivery Mechanism: Direct from community
Category:	Xen
Request Type:	Kernel - Enhancement from Upstream
d. Upstream Acceptance:	In Progress
Sponsor Priority	1
f. Severity: High
IBM Confidential:	no
Code Contribution:	3rd party code
g. Component Version Target:	2.6.33
 qemu 0.12

3. Business Case
The network performance for  communication across VM to VM and host-VM  must be close to native
perf. to migrate applications to KVM, be competitive with industry virtualization solutions, and
support efficient workloads even as a large number of VMs supported per host.

4. Primary contact at Red Hat: 
John Jarvis
jjarvis

5. Primary contacts at Partner:
Project Management Contact:
Albert Kopp, AKOPP.com

Technical contact(s):
Vivek Kashyap, vivk.com
Sridhar Samudrala, samudrala.com

IBM Manager:
Deneen T. Dock, deneen.com
=Comment: #1=================================================
Sridhar Samudrala <sri.com> - 
vhost-net patchset : add  tap and raw socket backend support to host kernel to improve network latency

Patches are submitted for inclusion in 2.6.33.
Comment 2 John Jarvis 2010-02-04 18:57:39 UTC 
So did this get accepted upstream in 2.6.33 and if so, is IBM planning to provide backports for this feature?  We are just about out of runway to do this for RHEL 6.0.
Comment 4 IBM Bug Proxy 2010-02-04 19:20:52 UTC 
------- Comment From sri.com 2010-02-04 14:16 EDT-------
vhost-net patches are accepted into davem's net-next-2.6 tree and are targeted for 2.6.34.

But, based on the discussions in the IBM/RH interlock calls, it looks like these patches are already in RHEL6 kernel tree.
Comment 5 IBM Bug Proxy 2010-02-04 19:41:21 UTC 
------- Comment From xma.com 2010-02-04 14:30 EDT-------
We also need to backport removing send queue patch for virtio_net. It could gain transmission performance. netperf TCP STREAM test shows 20% increase.

------- Comment From sri.com 2010-02-04 14:38 EDT-------
Shirley,
defer skb allocation patches to optimize virtio-net are tracked via another bugzilla.
Bug 58968   -  RH555698-[LTC 6.0 FEAT] KVM network performance: Defer skb allocation in virtio-net
Comment 6 John Jarvis 2010-02-04 19:47:22 UTC 
But there are no patches in this BZ nor in https://bugzilla.redhat.com/show_bug.cgi?id=555698 so if they did go into RHEL 6 kernel tree, where were they submitted?
Comment 7 IBM Bug Proxy 2010-02-04 22:11:03 UTC 
------- Comment From sri.com 2010-02-04 17:07 EDT-------
vhost-net patches were submitted by Michael Tsirkin of Redhat. Here are the links to the patches in net-next-2.6.

http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=05c2828c72c4eabf62376adfe27bd24797621f62
http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=5da779c34ccff5e1e617892b6c8bd8260fb1f04c
http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=3a4d5c94e959359ece6d6b55045c3f046677f55c
http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=17660f81243e998f36257881ac3ae61685bf91c1
Comment 9 Steve Best 2010-02-06 18:05:04 UTC 
(In reply to comment #7)
> ------- Comment From sri.com 2010-02-04 17:07 EDT-------
> vhost-net patches were submitted by Michael Tsirkin of Redhat. Here are the
> links to the patches in net-next-2.6.
> 

> 1) http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=05c2828c72c4eabf62376adfe27bd24797621f62
> 2) http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=5da779c34ccff5e1e617892b6c8bd8260fb1f04c
> 3) http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=3a4d5c94e959359ece6d6b55045c3f046677f55c
> 4) http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=17660f81243e998f36257881ac3ae61685bf91c1    

John Jarvis asked me to check to see if these 4 patches we in RHEL 6 and as of kernel-2.6.32-14.el6 patch 1, 2, 3 are in patch 4 is not in.
Comment 10 Steve Best 2010-02-09 14:26:32 UTC 
(In reply to comment #9)
> (In reply to comment #7)
> > ------- Comment From sri.com 2010-02-04 17:07 EDT-------
> > vhost-net patches were submitted by Michael Tsirkin of Redhat. Here are the
> > links to the patches in net-next-2.6.
> > 
> 
> > 1) http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=05c2828c72c4eabf62376adfe27bd24797621f62
> > 2) http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=5da779c34ccff5e1e617892b6c8bd8260fb1f04c
> > 3) http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=3a4d5c94e959359ece6d6b55045c3f046677f55c
> > 4) http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commitdiff;h=17660f81243e998f36257881ac3ae61685bf91c1    
> 
> John Jarvis asked me to check to see if these 4 patches we in RHEL 6 and as of
> kernel-2.6.32-14.el6 patch 1, 2, 3 are in patch 4 is not in.    

Patch 4 was just posted to rh-kernel mailing list by Michael Tsirkin the post is here [RHEL6 PATCH 8/8] vhost: fix TUN=m VHOST_NET=y
http://post-office.corp.redhat.com/archives/rhkernel-list/2010-February/msg00472.html
the bz for that post is 
https://bugzilla.redhat.com/show_bug.cgi?id=562837

I assume this patch will make it in RHEL6 and no additional work needs to be done for this bz.
Comment 14 Anthony Liguori 2010-03-31 16:07:38 UTC 
vhost-net is already in the RHEL6 kernel
Comment 15 dyuan 2010-06-13 07:36:27 UTC 
According to comment 14, change bug status to VERIFIED.
Comment 16 IBM Bug Proxy 2010-06-28 23:31:04 UTC 
------- Comment From sri.com 2010-06-28 19:21 EDT-------
Marking this feature as Verified.
Comment 17 releng-rhel@redhat.com 2010-07-02 19:19:29 UTC 
Red Hat Enterprise Linux Beta 2 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.
Comment 18 Red Hat Bugzilla 2023-09-14 01:19:58 UTC 
The needinfo request[s] on this closed bug have been removed as they have been unresolved for 1000 days
Note You need to log in before you can comment on or make changes to this bug.