Bug 1356161 – [RFE] prefer numa nodes close to host devices when using hostdev passthrough

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Bug 1356161 - [RFE] prefer numa nodes close to host devices when using hostdev passthrough

Summary:	[RFE] prefer numa nodes close to host devices when using hostdev passthrough

Status:	CLOSED CURRENTRELEASE

Aliases:	None

Product:	vdsm
Classification:	oVirt
Component:	RFEs (Show other bugs)
Sub Component:
Version:	4.18.1
Hardware:	Unspecified Unspecified

Priority	medium Severity medium (vote)
Target Milestone:	ovirt-4.1.0-alpha
Target Release:	4.19.2
Assigned To:	Martin Polednik
QA Contact:	Artyom
Docs Contact:

URL:
Whiteboard:
Keywords:	FutureFeature, Performance, Triaged

Depends On:
Blocks:	1430233
	Show dependency tree / graph

Reported:	2016-07-13 10:00 EDT by Martin Polednik
Modified:	2017-03-08 01:15 EST (History)
CC List:	3 users (show)

See Also:
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 09:48:08 EST
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	Virt
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Flags:	michal.skrivanek: ovirt‑4.1? alukiano: testing_plan_complete+ rule-engine: planning_ack? michal.skrivanek: devel_ack+ rule-engine: testing_ack+

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
oVirt gerrit	60637	master	MERGED	hostdev: report device MMIO numa node	2016-10-05 06:41 EDT
oVirt gerrit	60638	master	NEW	hostdev: expose numa_node in host device	2016-09-29 04:50 EDT
oVirt gerrit	60639	master	ABANDONED	utils: add utlity to generate positive cpuset notation	2016-07-25 10:12 EDT
oVirt gerrit	60640	master	NEW	hostdev: prefer numa nodes close to device MMIO	2016-10-05 06:42 EDT
oVirt gerrit	62063	master	MERGED	devices: add is_hostdevice attribute	2016-10-05 06:41 EDT
oVirt gerrit	62064	master	MERGED	hostdev: properly set is_hostdevice	2016-10-05 06:41 EDT

Groups: None (edit)

Description Martin Polednik 2016-07-13 10:00:31 EDT

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 08:55:11 EST

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 09:32:12 EST

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 01:33:24 EST

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

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