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Bug 1182817

Summary: [Docs] [Nova] [RFE] Virt driver guest NUMA node placement & topology
Product: Red Hat OpenStack Reporter: Summer Long <slong>
Component: documentationAssignee: Summer Long <slong>
Status: CLOSED CURRENTRELEASE QA Contact: Andrew Dahms <adahms>
Severity: medium Docs Contact:
Priority: high    
Version: unspecifiedCC: adahms, mariel, ndipanov, sferdjao, yeylon
Target Milestone: ---Keywords: Documentation, FutureFeature, Triaged
Target Release: 6.0 (Juno)   
Hardware: Unspecified   
OS: Unspecified   
URL: https://blueprints.launchpad.net/nova/+spec/virt-driver-numa-placement
Whiteboard:
Fixed In Version: Doc Type: Enhancement
Doc Text:
Story Points: ---
Clone Of: 1097989 Environment:
Last Closed: 2015-05-15 05:19:44 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:
Bug Depends On: 1097989    
Bug Blocks: 1227312    

Comment 2 Summer Long 2015-03-31 04:08:28 UTC 
Previous Compute versions delegated all CPU placement to the operating system kernel. Although the kernel attempted to keep guest processes running on a single NUMA node, this was not enforced. This meant that guests could drift across NUMA nodes, resulting in an inefficient usage of host resources and limiting guest performance.

With this update, Compute can now place guest instances on specific host NUMA nodes. The cloud administrator or tenant user can set preferences for the guest NUMA topology layout by enabling a scheduler filter that performs intelligent NUMA placement (affinity server group using hw:numa_policy=strict metadata). Compute takes into account the guest topology and then pins the guest instance to one or more host NUMA nodes, resulting in a more consistent guest performance and efficient use of host resources.
Comment 3 Summer Long 2015-04-17 05:32:14 UTC 
Description: https://review.openstack.org/#/c/93636/9/specs/juno/virt-driver-numa-placement.rst
Comment 5 Summer Long 2015-05-11 01:12:05 UTC 
Email sent.
Comment 9 Summer Long 2015-05-15 00:25:48 UTC 
Just realised Mikey is off to the states, adahms, can you take a look?
Comment 10 Andrew Dahms 2015-05-15 01:06:04 UTC 
Looks good to me.

Moving to VERIFIED.