On Mon, Jan 07, 2013 at 05:08:13PM +0800, lei yang wrote: > On Mon, Jan 7, 2013 at 4:58 PM, Stefan Hajnoczi <stefanha@xxxxxxxxx> wrote: > > On Sun, Jan 6, 2013 at 12:27 PM, lei yang <yanglei.fage@xxxxxxxxx> wrote: > >> What's the different with below combos? > > > > The difference is historical, it's just how the command-line options > > evolved over time. > > > >> 1)qemu --enable-kvm > > > > The old way. Still useful because it's slightly easier to type than > > --machine accel=kvm. > > > >> 2)qemu accel=kvm > > > > The "modern" way. > > > >> 3)qemu without above parameters when kvm kmod has been load > > > > There is a difference in behavior between QEMU and qemu-kvm here: > > > > QEMU uses TCG and not KVM by default, regardless of whether the kvm.ko > > module has been loaded or not. qemu-kvm uses KVM by default, if > > available. > > > > The qemu-kvm fork has been retired so it's best not to rely on this > > behavior. Future distro packages will be built from QEMU and unless a > > code change is made, the default accelerator is TCG. > > > > Thanks fro the explain > > So if we want use kvm we need to explicitly add "--enable-kvm" or " accel=kvm" > regardless kvm.ko load or not Yes. > How can we check we are using TCG or KVM, can we check this in guestos > or check this with monitor > can you show me the exactly command? The QEMU monitor "info kvm" command displays the status. Stefan -- 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
