Bug 866949
Summary: | It seems like libvirt detect's the CPU count and CPU model wrong on certain AMD Opteron CPU's when used with ovirt. | ||||||
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Product: | [Community] Virtualization Tools | Reporter: | Erik Meijer <erik.meijer01> | ||||
Component: | libvirt | Assignee: | Peter Krempa <pkrempa> | ||||
Status: | CLOSED CURRENTRELEASE | QA Contact: | |||||
Severity: | unspecified | Docs Contact: | |||||
Priority: | unspecified | ||||||
Version: | unspecified | CC: | dyasny, jdenemar, pkrempa | ||||
Target Milestone: | --- | ||||||
Target Release: | --- | ||||||
Hardware: | Unspecified | ||||||
OS: | Unspecified | ||||||
Whiteboard: | |||||||
Fixed In Version: | Doc Type: | Bug Fix | |||||
Doc Text: | Story Points: | --- | |||||
Clone Of: | Environment: | ||||||
Last Closed: | 2012-10-29 11:11:20 UTC | Type: | Bug | ||||
Regression: | --- | Mount Type: | --- | ||||
Documentation: | --- | CRM: | |||||
Verified Versions: | Category: | --- | |||||
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
Cloudforms Team: | --- | Target Upstream Version: | |||||
Embargoed: | |||||||
Attachments: |
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Description
Erik Meijer
2012-10-16 11:32:56 UTC
The issue with missing cores is probably resolved by https://bugzilla.redhat.com/show_bug.cgi?id=825095 I got the CPU model by applying this caps.py http://gerrit.ovirt.org/#/c/5035/ It is said that this fix will resolve the missing cores problem but I have not applied that fix. http://gerrit.ovirt.org/#/c/7097/ This might have been fixed in v0.10.0 by (but we need the files from /sys to be sure): commit 80533ca25d809a2a3e81266a0acabf61a0f86ced Author: Peter Krempa <pkrempa> Date: Mon Jul 9 16:57:49 2012 +0200 nodeinfo: Fix gathering of nodeinfo data structure This patch changes the way data to fill the nodeinfo structure are gathered. We've gathere the test data by iterating processors an sockets separately from nodes. The reported data was based solely on information about core id. Problems arise when eg cores in mulit-processor machines don't have same id's on both processors or maybe one physical processor contains more NUMA nodes. This patch changes the approach how we detect processors and nodes. Now we start at enumerating nodes and for each node processors, sockets and threads are enumerated separately. This approach provides acurate data that comply to docs about the nodeinfo structure. This also enables to get rid of hacks: see commits 10d9038b744a69c8d4bd29c2e8c012a097481586, ac9dd4a676f21b5e3ca6dbe0526f2a6709072beb. (Those changes in nodeinfo.c are efectively reverted by this patch). This patch also changes output of one of the tests, as the processor topology is now acquired more precisely. Created attachment 628151 [details]
Tar of /sys/devices/system/{cpu,node}
The test data are in the format required by libvirt to correctly detect the processor topology after commit 80533ca25d809a2a3e81266a0acabf61a0f86ced so this issue should be fixed in the current upstream release now. |