  We consider blow-up solutions of a semilinear wave equation with a loglog
perturbation of the power nonlinearity in the subconformal case, and show that
the blow-up rate is given by the solution of the associated ODE which has the
same blow-up time. In fact, our result shows an upper bound and a lower bound
of the blow-up rate, both proportional to the blow-up solution of the
associated ODE. The main difficulty comes from the fact that the PDE is not
scaling invariant.
