=item B<-1>
Display physical CPUs by default (instead of domains).
+
+Under each domain column, two numbers are shown. The first is
+the percentage of the physical CPU used by the domain and the
+hypervisor together. The second is the percentage used by just
+the domain.
+
When virt-top is running, use the I<1> key to toggle
between physical CPUs and domains display.