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Bug 1357461 - Incorrect host cpu is given to emulator threads when cpu_realtime_mask flag is set.
Summary: Incorrect host cpu is given to emulator threads when cpu_realtime_mask flag i...
Alias: None
Product: Red Hat OpenStack
Classification: Red Hat
Component: openstack-nova
Version: 8.0 (Liberty)
Hardware: x86_64
OS: Linux
Target Milestone: ---
: ---
Assignee: Sahid Ferdjaoui
QA Contact: Prasanth Anbalagan
Depends On:
Blocks: 1391927 1392019 1392367
TreeView+ depends on / blocked
Reported: 2016-07-18 09:42 UTC by Peng Liu
Modified: 2016-12-21 16:39 UTC (History)
14 users (show)

Fixed In Version: openstack-nova-12.0.5-7.el7ost
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1391927 (view as bug list)
Last Closed: 2016-12-21 16:39:33 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
OpenStack gerrit 356383 None None None 2016-08-17 10:56:39 UTC
Red Hat Bugzilla 1298079 None CLOSED [RFE] - Provide option in Nova to configure emulator threads to run on dedicated physical CPU's 2019-03-05 19:40:22 UTC
Red Hat Product Errata RHSA-2016:2991 normal SHIPPED_LIVE Moderate: openstack-cinder, openstack-glance, and openstack-nova update 2016-12-21 21:34:31 UTC

Internal Links: 1298079

Description Peng Liu 2016-07-18 09:42:05 UTC
Description of problem:
When using the cpu_realtime and cpu_realtim_mask flag to create new instance, the 'cpuset' of 'emulatorpin' option is using the id of vcpu which is incorrect. The id of host cpu should be used here.

    <vcpupin vcpu='0' cpuset='2'/>
    <vcpupin vcpu='1' cpuset='3'/>
    <emulatorpin cpuset='0'/>          ### the cpuset should be '2' here, when cpu_realtime_mask=^0.  
    <vcpusched vcpus='1' scheduler='fifo' priority='1'/>

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

How reproducible:
Boot new instance with cpu_realtime_mask flavor.

Steps to Reproduce:
1. Create RT flavor
nova flavor-create m1.small.performance 6 2048 20 2
nova flavor-key m1.small.performance set hw:cpu_realtime=yes
nova flavor-key m1.small.performance set hw:cpu_realtime_mask=^0
nova flavor-key m1.small.performance set hw:cpu_policy=dedicated
2. Boot a instance with this flavor
3. Check the xml of the new instance

Actual results:
    <vcpupin vcpu='0' cpuset='2'/>
    <vcpupin vcpu='1' cpuset='3'/>
    <emulatorpin cpuset='0'/>          
    <vcpusched vcpus='1' scheduler='fifo' priority='1'/>

Expected results:
    <vcpupin vcpu='0' cpuset='2'/>
    <vcpupin vcpu='1' cpuset='3'/>
    <emulatorpin cpuset='2'/>          
    <vcpusched vcpus='1' scheduler='fifo' priority='1'/>

Additional info:

Comment 6 errata-xmlrpc 2016-12-21 16:39:33 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.

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