Bug 1538465

Summary:	Support MTU property with OVN networks
Product:	[oVirt] ovirt-provider-ovn	Reporter:	Mor <mkalfon>
Component:	provider	Assignee:	Dominik Holler <dholler>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Michael Burman <mburman>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bugs, danken, mburman, ylavi
Target Milestone:	ovirt-4.2.5	Flags:	rule-engine: ovirt-4.2+ rule-engine: ovirt-4.3+
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	No Doc Update
Doc Text:	undefined	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-07-31 15:25:06 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	Network	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Mor 2018-01-25 07:10:27 UTC

Description of problem:
On OVN network, there should be an option to set or update the MTU as it is defined in the Neutron API. This could aid in scenarios where the MTU needs to be adjusted according to the environment configuration. 
Examples for use cases:
- Configuring Jumbo Frames (packet length > 1500), to improve network performance.
- Decrease the default MTU, according to the environment limitations (switch/router). 

Version-Release number of selected component (if applicable):
ovirt-provider-ovn-1.2.5-1.el7ev.noarch

How reproducible:
100%

Steps to Reproduce:
1. Update / Create OVN network

Actual results:
MTU property is not supported.

Expected results:
Should be supported.

Additional info:

Comment 1 Marcin Mirecki 2018-02-15 14:22:39 UTC

Related OVS bug:
https://bugzilla.redhat.com/show_bug.cgi?id=1545290

Comment 2 Mor 2018-02-15 14:23:34 UTC

MTU value adjustment in the lab that solved the performance issue with 10GE:
- VM vNICs (through guest OS) - 8492
- vnets - 8492
- host NICs - 8492
- Switch ports that connects the host NICs - 9216 (but it could be less)

Comment 3 Mor 2018-02-15 14:40:51 UTC

Correction:
* the host NICs - 9000

On host:
# ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master ovirtmgmt state UP mode DEFAULT qlen 1000
    link/ether 14:18:77:43:ef:0d brd ff:ff:ff:ff:ff:ff
3: em2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen 1000
    link/ether 14:18:77:43:ef:0e brd ff:ff:ff:ff:ff:ff
4: em3: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen 1000
    link/ether 14:18:77:43:ef:0f brd ff:ff:ff:ff:ff:ff
5: em4: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen 1000
    link/ether 14:18:77:43:ef:10 brd ff:ff:ff:ff:ff:ff
6: p7p1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen 1000
    link/ether 00:0a:f7:8f:59:86 brd ff:ff:ff:ff:ff:ff
7: p7p2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen 1000
    link/ether 00:0a:f7:8f:59:87 brd ff:ff:ff:ff:ff:ff
8: p5p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT qlen 1000
    link/ether a0:36:9f:8f:37:00 brd ff:ff:ff:ff:ff:ff
9: p5p2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP mode DEFAULT qlen 1000
    link/ether a0:36:9f:8f:37:02 brd ff:ff:ff:ff:ff:ff
40: ;vdsmdummy;: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000
    link/ether da:01:e9:c4:fb:13 brd ff:ff:ff:ff:ff:ff
41: ovs-system: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000
    link/ether 66:07:70:ca:dd:cb brd ff:ff:ff:ff:ff:ff
43: br-int: <BROADCAST,MULTICAST> mtu 8492 qdisc noop state DOWN mode DEFAULT qlen 1000
    link/ether f6:3a:8e:6d:79:44 brd ff:ff:ff:ff:ff:ff
44: ovirtmgmt: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT qlen 1000
    link/ether 14:18:77:43:ef:0d brd ff:ff:ff:ff:ff:ff
57: genev_sys_6081: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65470 qdisc noqueue master ovs-system state UNKNOWN mode DEFAULT qlen 1000
    link/ether 12:65:a9:b4:38:90 brd ff:ff:ff:ff:ff:ff
62: vethint0@vethouter1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 8492 qdisc noqueue master ovs-system state UP mode DEFAULT qlen 1000
    link/ether 8a:fd:5c:00:72:41 brd ff:ff:ff:ff:ff:ff
63: vethouter1@vethint0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 8492 qdisc noqueue state UP mode DEFAULT qlen 1000
    link/ether 52:d2:29:ab:79:12 brd ff:ff:ff:ff:ff:ff
72: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 8492 qdisc pfifo_fast master ovs-system state UNKNOWN mode DEFAULT qlen 1000
    link/ether fe:1a:4a:16:20:37 brd ff:ff:ff:ff:ff:ff
73: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master ovirtmgmt state UNKNOWN mode DEFAULT qlen 1000
    link/ether fe:1a:4a:16:20:3c brd ff:ff:ff:ff:ff:ff

Comment 4 Mor 2018-02-15 14:49:00 UTC

On the VM:
# ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 8492 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 00:1a:4a:16:20:37 brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 00:1a:4a:16:20:3c brd ff:ff:ff:ff:ff:ff

eth0 is the OVN vNIC

Comment 5 Michael Burman 2018-07-16 12:44:29 UTC

Verified on - 4.2.5.2_SNAPSHOT-79.gffafd93.0.scratch.master.el7ev

Comment 6 Sandro Bonazzola 2018-07-31 15:25:06 UTC

This bugzilla is included in oVirt 4.2.5 release, published on July 30th 2018.

Since the problem described in this bug report should be
resolved in oVirt 4.2.5 release, it has been closed with a resolution of CURRENT RELEASE.

If the solution does not work for you, please open a new bug report.