Red Hat Bugzilla – Bug 1243601
Overcloud deploys default to qemu instead of kvm
Last modified: 2015-10-15 12:21:13 EDT
Description of problem: By default the overcloud deployment uses qemu instead of kvm, and it's not obvious from the documentation that this needs to be changed. Version-Release number of selected component (if applicable): How reproducible: Always. Steps to Reproduce: 1. Deploy to baremetal without specifying --libvirt-type kvm 2. Boot an instance. It will use unaccelerated qemu. 3. Actual results: Yugo performance from VM. Expected results: Ferrari performance from VM. Additional info: For RHOS 7 GA, this is likely a doc fix. We should discuss whether to change the default in future releases, however.
Note that this can be fixed after deployment by re-running the same deployment command with "--libvirt-type kvm" added.
This is fairly critical and should be fixed as soon as practical. In addition to affecting performance, it prevents the use of features such as SR-IOV PCI passthrough.
Added a few doc improvements.
I also added a patch to change the default to KVM instead of QEMU, if it is decided that this is a bug that should be fixed. https://review.gerrithub.io/#/c/244069
This bug needs documentation changes in any case, but we can also change the default from qemu to kvm, but I get conflicting opinions about if we should do that.
(In reply to Lennart Regebro from comment #10) > This bug needs documentation changes in any case, but we can also change the > default from qemu to kvm, but I get conflicting opinions about if we should > do that. WHY? We don't recommend the use of qemu emulation for real environments period from a Nova perspective.
There should no confusion any longer here. Default should be kvm. Thanks.
[stack@instack ~]$ rpm -qa | grep python-rdomanager-oscplugin python-rdomanager-oscplugin-0.0.10-1.el7ost.noarch Deploy command: openstack overcloud deploy --templates Resulting config: [heat-admin@overcloud-compute-0 ~]$ sudo grep virt_type /etc/nova/nova.conf | grep -v ^# virt_type=kvm
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-2015:1862
*** Bug 1270397 has been marked as a duplicate of this bug. ***
*** Bug 1270396 has been marked as a duplicate of this bug. ***