* Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx> wrote: > On Tue, 30 Jun 2009, Ingo Molnar wrote: > > > But what if not? What if the kernel can run on up to 4096 CPUs > > and runs on a big box. Why should a virtual machine have the > > illogical choice between either wasting a lot of RAM > > preallocating stuff, or limiting its own extendability. > > The kernel may be able to run on 4096 but the machines config > information that is available via ACPI knows how many processors > the machine we are booting on is able to add. I think we might be talking past each other. The usecase i'm talking about is to boot a generic, many-CPUs-capable kernel in a guest image. How would you allow that guest to stay on 2 virtual CPUs but still be able to hot-plug many other CPUs if the guest context rises above its original CPU utilization? Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
