Hi. I would like to workaround a bug, when after live-migration of KVM guest, there is a 100% steal time shown in guest. I've read, that disabling 'kvm_steal_time' feature should workarund this bug, but i can't find a way to disable it in libvirt's domain xml file.

Tried in <cpu> section: <feature policy='disable' name='kvm_steal_time'/> but that doesn't work. Also, couldn't find any related information in libvirt documentation. Google helps neither. How can I disable this feature? Thanks in advance. Piotr Rybicki _______________________________________________ libvirt-users mailing list libvirt-users(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users

27 нояб. 2015 г. 14:15 пользователь "Martin Kletzander" <mkletzan(a)redhat.com&gt; написал: > > On Fri, Nov 20, 2015 at 04:31:56PM +0100, Piotr Rybicki wrote: >> >> Hi. >> >> I would like to workaround a bug, when after live-migration of KVM >> guest, there is a 100% steal time shown in guest. >> >> I've read, that disabling 'kvm_steal_time' feature should workarund >> this bug, but i can't find a way to disable it in libvirt's domain xml >> file. >> > > There is no support for that in libvirt. Either we must addit ad a > feature (patches welcome), but if that's there just for a workaround, > I would suggest chasing the original bug. > > If you just want to check that the workaround works, you could check > how the '-cpu ' parameter looks like when the domain is running and > then use the unsupported way of adding parameters to the qemu > commandline to specify the -cpu parameter again (qemu should use the > last one, so it should work), something like this: > > <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0 '> > ... > <qemu:commandline> > <qemu:arg value='-cpu'/> > <qemu:arg value='${CPU_SPEC},-kvm_steal_time'/> > </qemu:commandline> > </domain> > > where ${CPU_SPEC} is the next parameter after the '-cpu' one from the > command line, so for qemu command line similar to this: > > qemu-kvm ... -cpu Nehalem,+feat,something ... > > the line in XML would be: > > <qemu:arg value='Nehalem,+feat,something,-kvm_steal_time'/> > > HTH, > > Martin > >> Tried in <cpu> section: >> <feature policy='disable' name='kvm_steal_time'/> >> but that doesn't work. >> >> Also, couldn't find any related information in libvirt documentation. >> Google helps neither. >> >> How can I disable this feature? >> >> Thanks in advance. >> Piotr Rybicki >> >> Does it possible to calculate steal time for vm if I have libvirt and domain stats?

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2015-11-27 16:57 GMT+03:00 Martin Kletzander <mkletzan(a)redhat.com&gt;: > I don't think we report that in domain stats, but top/virt-top could > help with that. Ok libvirt can't get this value, but does it possible if i know cpu stats of domain and host info (i don't know which =)) determine for specific domain does it possible have steal time or not?