Bug 1571744 - [RFE][Deployment] add ability to configure extra CPU flags for named CPU models
Summary: [RFE][Deployment] add ability to configure extra CPU flags for named CPU models
Status: CLOSED ERRATA
Alias: None
Product: Red Hat OpenStack
Classification: Red Hat
Component: puppet-nova
Version: 12.0 (Pike)
Hardware: All
OS: Linux
high
high
Target Milestone: z3
: 12.0 (Pike)
Assignee: Rajesh Tailor
QA Contact: nova-maint
URL:
Whiteboard:
Keywords: FutureFeature, InstallerIntegration, Triaged, ZStream
Depends On: 1398343 1547954 1570610 1570611 1570614 1570617 1571750 1571756 1612360
Blocks: 1571741
TreeView+ depends on / blocked
 
Reported: 2018-04-25 10:53 UTC by Rajesh Tailor
Modified: 2018-08-20 13:01 UTC (History)
23 users (show)

(edit)
Nova's libvirt driver now allows the specification of granular CPU feature flags when configuring CPU models.  

One benefit of this change is the alleviation of a performance degradation that has been experienced on guests running with certain Intel-based virtual CPU models after application of the "Meltdown" CVE fixes. This guest performance impact is reduced by exposing the CPU feature flag 'PCID' ("Process-Context ID") to the *guest* CPU, assuming that the PCID flag is available in the physical hardware itself.

For more details, refer to the  documentation of ``[libvirt]/cpu_model_extra_flags`` in the ``nova.conf`` file for usage details.
Clone Of: 1547954
(edit)
Last Closed: 2018-08-20 12:59:48 UTC


Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2331 None None None 2018-08-20 13:01 UTC
OpenStack gerrit 561796 None None None 2018-04-25 10:53 UTC

Comment 13 errata-xmlrpc 2018-08-20 12:59:48 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-2018:2331


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