Bug 996174
Summary: | xen domU kernel does not activate all vcpus | ||
---|---|---|---|
Product: | [Fedora] Fedora | Reporter: | Carl Roth <roth> |
Component: | xen | Assignee: | Michael Young <m.a.young> |
Status: | CLOSED EOL | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
Severity: | high | Docs Contact: | |
Priority: | unspecified | ||
Version: | 19 | CC: | jforbes, kraxel, m.a.young, virt-maint, vkuznets |
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | x86_64 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Bug Fix | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2015-02-17 16:43:51 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: |
Description
Carl Roth
2013-08-12 14:59:53 UTC
I browsed over to http://wiki.xen.org/wiki/Paravirt_Linux_CPU_Hotplug http://lists.xen.org/archives/html/xen-devel/2010-05/msg00516.html and did some more experimentation, I find 1. libvirt domain configuration specifies 2 cpus for the guest 2. 'xl list' shows 1 cpu after the guest is started 3. /proc/cpuinfo on the guest shows 1 cpu 4. boot messages on the guest suggest 2 cpus, but only one is brought on-line 5. /sys/devices/system/cpu on the guest only shows 1 cpu 6. (as above) 'xl vcpu-list' shows two cpus, but one is paused/offline Then, I tried # xl vcpu-set xen-d975xbx-anon 2 At that point, the 2nd cpu entry shows up in /sys/devices/system/cpu. Then, on the guest: # echo "1" > /sys/devices/system/cpu/cpu1/online and the cpu comes on-line. The /proc/cpuinfo is correct, as is the 'xl list' and 'xl vcpu-list' output on the host. Perhaps something is not getting configured correctly in libxl based on the libvirt configuration. Please advise. What's the (intended) relationship between the 'vcpu' tag in the libvirt xml, and the boot-time vcpu settings for a guest? This did used to "just work" for F18. The secondary issue (why a newly-available vcpu is not automatically brought on-line on the guest) appears to be a "known issue" with some debate surrounding it, so I won't bother. As per http://libvirt.org/formatdomain.html#elementsCPUAllocation (though the text there is a bit confusing) should the 'current' attribute be specified to enable the vcpus at startup? This message is a notice that Fedora 19 is now at end of life. Fedora has stopped maintaining and issuing updates for Fedora 19. It is Fedora's policy to close all bug reports from releases that are no longer maintained. Approximately 4 (four) weeks from now this bug will be closed as EOL if it remains open with a Fedora 'version' of '19'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 19 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. Fedora 19 changed to end-of-life (EOL) status on 2015-01-06. Fedora 19 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed. |