12:10 a.m.
Hi experts
I want to use libvirt doing the migration
migration the guest from core 0 to core 2, Is there a way to do this ? any
points?
Lei
1:52 a.m.
New subject: [libvirt-users] Re: help about migration with libvirt
The 03/12/13, lei yang wrote:
Hi experts
I want to use libvirt doing the migration
Basically, migration allows moving a VM from host to another.
migration the guest from core 0 to core 2, Is there a way to do
this ? any
points?
This is about CPU affinity. You may look at CPU pinning with 'vcpupin'
in the manual of virsh. It is possible to enable vCPU pinning in libvirt
guest XML.
Don't know if libvirt supports applying CPU affinity at guest runtime
but you could do it with usual tools (taskset, htop, etc).
--
Nicolas Sebrecht
9:52 a.m.
On Tue, Dec 3, 2013 at 3:52 PM, Nicolas Sebrecht <nsebrecht(a)piing.fr> wrote:
The 03/12/13, lei yang wrote:
> Hi experts
>
> I want to use libvirt doing the migration
Basically, migration allows moving a VM from host to another.
> migration the guest from core 0 to core 2, Is there a way to do this
? any
> points?
This is about CPU affinity. You may look at CPU pinning with 'vcpupin'
in the manual of virsh. It is possible to enable vCPU pinning in libvirt
guest XML.
Don't know if libvirt supports applying CPU affinity at guest runtime
but you could do it with usual tools (taskset, htop, etc).
I don't know how to change the affinity use tasket for the vms in the
libvirt,
my goal it to get the downtime from core 0 to core 2
Lei
--
Nicolas Sebrecht
10 a.m.
On 12/03/2013 12:52 AM, Nicolas Sebrecht wrote:
This is about CPU affinity. You may look at CPU pinning with
'vcpupin'
in the manual of virsh. It is possible to enable vCPU pinning in libvirt
guest XML.
Don't know if libvirt supports applying CPU affinity at guest runtime
Yes, 'virsh vcpupin' can be used to change CPU affinity at runtime.
but you could do it with usual tools (taskset, htop, etc).
Going behind libvirt's back may lead to unexpected surprises. Also,
preferring the libvirt interfaces for changing CPU affinity gives you
better flexibility of changing things even when using remote URIs (you
don't have to open separate ssh sessions to the remote machines to run
secondary tools).
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
10:05 a.m.
On Wed, Dec 4, 2013 at 12:00 AM, Eric Blake <eblake(a)redhat.com> wrote:
On 12/03/2013 12:52 AM, Nicolas Sebrecht wrote:
> This is about CPU affinity. You may look at CPU pinning with 'vcpupin'
> in the manual of virsh. It is possible to enable vCPU pinning in libvirt
> guest XML.
>
> Don't know if libvirt supports applying CPU affinity at guest runtime
Yes, 'virsh vcpupin' can be used to change CPU affinity at runtime.
my case is
migrate vm from core 0 to core 1 and get the downtime
does" virsh vcpupin" work for me, and can you point me the whole step
Lei
> but you could do it with usual tools (taskset, htop, etc).
Going behind libvirt's back may lead to unexpected surprises. Also,
preferring the libvirt interfaces for changing CPU affinity gives you
better flexibility of changing things even when using remote URIs (you
don't have to open separate ssh sessions to the remote machines to run
secondary tools).
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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Nicolas Sebrecht