Bug 1780729

Summary:	measure the time needed by ovn-controller to resync to a new SB db
Product:	Red Hat Enterprise Linux Fast Datapath	Reporter:	Timothy Redaelli <tredaelli>
Component:	openvswitch2.11	Assignee:	lorenzo bianconi <lorenzo.bianconi>
Status:	CLOSED ERRATA	QA Contact:	ying xu <yinxu>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	RHEL 8.0	CC:	ctrautma, jhsiao, jishi, kfida, lorenzo.bianconi, qding, ralongi, tredaelli
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	openvswitch2.11-2.11.0-30.el8fdp	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1776883	Environment:
Last Closed:	2020-01-22 04:02:49 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:

Description Timothy Redaelli 2019-12-06 18:10:07 UTC

+++ This bug was initially created as a clone of Bug #1776883 +++

+++ This bug was initially created as a clone of Bug #1720653 +++

Additional info:
We are interested in the time that it takes ovn-controller to resync to a
different southbound database with substantially the same content.

So for example after creating a lot of logical switches and switch
ports like in the scale tests, copy the southbound database file (or
create an entirely new one with different switches and ports) and start
a new ovsdb-server on a different port on the server.  The change ovn-
remote in the local vswitch and see how long it takes for ovn-
controller to update the flows in OVS based on the new database.

Girish said that the buffers that ovn-controller used to download the
new database were pretty small and when they bumped the size from IIRC
4k -> 64k the download itself went quite a bit faster.

But in the end, it is not clear what the delay from (a) change ovn-
remote to (b) OVS flows are synchronized, is and if we need to look
into optimizing that.

Comment 2 ying xu 2020-01-14 06:22:39 UTC

test on version 2.11-35
[root@dell-per730-19 qos]# rpm -qa|grep openvs
python3-openvswitch2.11-2.11.0-35.el8fdp.x86_64
kernel-kernel-networking-openvswitch-ovn-qos-1.0-1.noarch
openvswitch2.11-2.11.0-35.el8fdp.x86_64
kernel-kernel-networking-openvswitch-ovn-common-1.0-7.noarch

start time:
Tue Jan 14 01:16:29 EST 2020
end time:
Tue Jan 14 01:17:42 EST 2020

time=01:13

test on version 2.11-26
[root@dell-per730-19 qos]# rpm -qa|grep openvs
python3-openvswitch2.11-2.11.0-26.el8fdp.x86_64
kernel-kernel-networking-openvswitch-ovn-qos-1.0-1.noarch
openvswitch2.11-2.11.0-26.el8fdp.x86_64
kernel-kernel-networking-openvswitch-ovn-common-1.0-7.noarch

start time:
Tue Jan 14 00:43:24 EST 2020
end time:
Tue Jan 14 00:44:45 EST 2020
time=01:21

set verified

Comment 4 errata-xmlrpc 2020-01-22 04:02:49 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

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

https://access.redhat.com/errata/RHSA-2020:0171