Hello. I'm struggeling a little bit with the setvcpus command. I'm trying now to get this running for a linux VM. Here is what i have: <vcpu placement='auto' current='2'>4</vcpu> Now the VM is starting with 2 CPUs. When i try to increase the number of CPUs i get: setvcpus dev --guest 4 error: invalid argument: requested vcpu count is greater than the count of enabled vcpus in the domain: 4 > 2

Strange thing is when i set in the xml file: <vcpu placement='auto' current='4'>4</vcpu> the VM starts with 4CPUs and setting the CPUs works.

I can do: setvcpus dev --guest 2 and: setvcpus dev --guest 4 Is this a bug? Should i try to upgrade to 1.2.10? There seem to be a lot of changes in it regarding setvcpus. thanks and cheers t. _______________________________________________ libvirt-users mailing list libvirt-users(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users

Am 05.11.14 11:48, schrieb Martin Kletzander: > On Wed, Nov 05, 2014 at 11:35:37AM +0100, Thomas Stein wrote: >> Hello. >> >> I'm struggeling a little bit with the setvcpus command. I'm trying now >> to get this running for a linux VM. Here is what i have: >> >> <vcpu placement='auto' current='2'>4</vcpu>

Am 05.11.14 14:48, schrieb Eric Blake: > On 11/05/2014 01:20 PM, Thomas Stein wrote: >> Am 05.11.14 11:48, schrieb Martin Kletzander: >>> On Wed, Nov 05, 2014 at 11:35:37AM +0100, Thomas Stein wrote: >>>> Hello. >>>> >>>> I'm struggeling a little bit with the setvcpus command. I'm trying now >>>> to get this running for a linux VM. Here is what i have: >>>> >>>> <vcpu placement='auto' current='2'>4</vcpu> > > This is one case where xen may be a bit more powerful than current qemu > support. Xen supports booting a guest with a promise of a maximum cpu > larger than what it boots with; but I don't know that qemu does that > well yet. For now, with qemu, you pretty much have to boot with all > cpus enabled, then after the guest is up and running, disable the cpus > you don't plan to use right away. CPU hotplug/hot-unplug is still a > work in progress in qemu (for example, some versions of qemu support > hotplug but not hot-unplug). I haven't played much with it myself to > know what minimum version of libvirt and qemu will do what you want, so > you may have to do some experimentation. Thanks. I let you know if my experiments lead to some discoveries.