Thus spake David Mohr <damailings@xxxxxxxx>: > On 2012-11-29 07:48, Julian Stecklina wrote: >> Thus spake David Mohr <damailings@xxxxxxxx>: >> >>> * vm->vm (same host) 22k >> >> This number is in the same ballpark as what I am seeing on pretty >> much >> the same hardware. >> >> AFAICS, there is little you can do to the current virtio->virtio code >> path that would make this substantially faster. > > Thanks for the feedback. Considering that it's better than the > hardware network performance my main issue is actually the latency of > communication between VMs on different hosts: > * vm->vm (diff. hosts) 7k > > It is obvious that there is a lot more going on compared to same host > communication, but only ~30% of the performance when the network > hardware should not be slowing it down (too) much? You are probably better of using SR-IOV NICs with PCI passthrough in this case. Maybe someone can comment on whether virtual interrupt delivery and posted interrupts[1] are already usable. The first one should help in either the virtio and SR-IOV scenarios, the latter only applies to SR-IOV (and PCI passthrough in general). Julian [1] http://www.spinics.net/lists/kvm/msg82762.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
