Bug 882226 - ARM platforms lack NUMA node information
ARM platforms lack NUMA node information
Product: Virtualization Tools
Classification: Community
Component: libvirt (Show other bugs)
arm7 Unspecified
unspecified Severity unspecified
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Assigned To: Libvirt Maintainers
Depends On:
Blocks: LibvirtNonX86
  Show dependency treegraph
Reported: 2012-11-30 07:55 EST by Daniel Berrange
Modified: 2016-03-23 20:08 EDT (History)
2 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2016-03-23 20:08:57 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
udevadm info --export-db for devices (114.44 KB, text/plain)
2012-11-30 07:55 EST, Daniel Berrange
no flags Details

  None (edit)
Description Daniel Berrange 2012-11-30 07:55:57 EST
Created attachment 655006 [details]
udevadm info --export-db for devices

Description of problem:
I have an Chromebook with a Cortex A-15  ARM CPU. Libvirt is not reporting any NUMA information in virsh capabilites, 

# virsh capabilities



though nodeinfo says there is 1 node

# virsh nodeinfo
CPU model:           armv7l
CPU(s):              2
CPU frequency:       0 MHz
CPU socket(s):       1
Core(s) per socket:  2
Thread(s) per core:  1
NUMA cell(s):        1
Memory size:         2069816 kB

# virsh freecell
error: this function is not supported by the connection driver: NUMA memory information not available on this platform

The cause is that numactl is x86-only. For other platforms libvirt simply disables NUMA information. A more satisfactory approach is probably to just report a single node in the capabilities, and make freecell hardcode a single node.

This allows applications to use the NUMA functionality regardless of platform

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

How reproducible:
Comment 1 Cole Robinson 2016-03-23 20:08:57 EDT
commit 8d3d05d3c16d39bf993833d18e04902c5ff454cf
Author: Daniel P. Berrange <berrange@redhat.com>
Date:   Wed Apr 3 21:11:15 2013 +0100

    Create fake NUMA info if libnuma isn't available

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