Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

Bug 1356161

Summary:	[RFE] prefer numa nodes close to host devices when using hostdev passthrough
Product:	[oVirt] vdsm	Reporter:	Martin Polednik <mpoledni>
Component:	RFEs	Assignee:	Martin Polednik <mpoledni>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Artyom <alukiano>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.18.1	CC:	bugs, michal.skrivanek, trichard
Target Milestone:	ovirt-4.1.0-alpha	Keywords:	FutureFeature, Performance, Triaged
Target Release:	4.19.2	Flags:	michal.skrivanek: ovirt-4.1? alukiano: testing_plan_complete+ rule-engine: planning_ack? michal.skrivanek: devel_ack+ rule-engine: testing_ack+
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
Doc Text:	With this release, if you do not specify any NUMA mapping, Red Hat Virtualization defaults to a NUMA node which contains the host device's memory-mapped I/O (MMIO). This configuration is only preferred, rather than strictly required.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-02-01 14:48:08 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	Virt	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1430233

Description Martin Polednik 2016-07-13 14:00:31 UTC

Description of problem:
On NUMA aware systems, host device's MMIO memory region resides on one of available numa nodes. We should prefer such node when starting VM with host devices to improve device performance and latency as memory reads and writes are faster within a node (distance 1.0).

Comment 1 Sandro Bonazzola 2016-12-12 13:55:11 UTC

The fix for this issue should be included in oVirt 4.1.0 beta 1 released on December 1st. If not included please move back to modified.

Comment 2 Artyom 2017-01-16 14:32:12 UTC

Verified on vdsm-4.19.1-44.git945b2f6.el7.centos.x86_64 by polarion test cases.

1) The VM with PCI host device(has numa_node=0), runs with preferred NUMA node 0
2) NUMA pinning override PCI host device NUMA mode.

Comment 3 Tahlia Richardson 2017-02-06 06:33:24 UTC

Updated doc text to be appropriate for a release note. I'll be opening a docs bug based on the full doc text shortly.