Ok, so *maybe* - and I pretty much have no clue about virt - but just *maybe*, that kvmclock thing can be shared by all CPUs in a *guest* then. As in: the guest should see stable clocks which are the same regardless from which vCPU they're read and so on... Just a dumb idea anyway - this is me thinking about baremetal and trying to convert that to virt. But I'd say the memory savings aspect is something we can discuss later, when there's time and after the regression at hand has been addressed... Thx. -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --