Bug 1753845

Summary:	ovn-controller recomputing flows for any change into the external_ids columns of certail SB tables.
Product:	Red Hat Enterprise Linux Fast Datapath	Reporter:	Numan Siddique <nusiddiq>
Component:	ovn2.11	Assignee:	Numan Siddique <nusiddiq>
Status:	CLOSED CURRENTRELEASE	QA Contact:	haidong li <haili>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	FDP 19.G	CC:	ctrautma, haili, yalli
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Last Closed:	2019-10-13 17:35:24 UTC	Type:	Bug
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Description Numan Siddique 2019-09-20 04:21:17 UTC

Description of problem:

If CMS updates the external_ids column of logical_switch_port/logical_router_port, ovn-northd updates the same to the corresponding Port_Binding row. And this causes ovn-controller to wakeup and recompute flows. This results in unnecessary CPU usage

Version-Release number of selected component (if applicable):


How reproducible:

Run
ovn-nbctl set logical_switch_port <PORT_NAME> external_ids:foo=bar in a continuous loop and notice the notice the ovn-controller log file and the CPU usage of ovn-controller.

This would result in 100% cpu usage.

Steps to Reproduce:
1.
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Actual results:

ovn-controller should not recompute logical flows and this should not result in 100% cpu usage.


Expected results:


Additional info:

Comment 1 Numan Siddique 2019-09-20 04:23:41 UTC

This issue is seen in a customer deployment - https://bugzilla.redhat.com/show_bug.cgi?id=1740335

Comment 2 Numan Siddique 2019-10-13 17:34:58 UTC

This issue is not seen in 19.F ovn2.11-2.11.1-2.

Closing this BZ.

Comment 3 Numan Siddique 2019-10-13 17:35:24 UTC

This issue is not seen in 19.F ovn2.11-2.11.1-2.

Closing this BZ.