  The non-perturbative running of the quark mass in the Schroedinger functional
scheme is computed over a large energy range (covering scales differing by two
orders of magnitude). This allows to relate lattice estimates of the running
quark mass to the renormalization group invariant mass. The result is used in a
preliminary computation of the strange quark mass in the theory with two
flavors of non-perturbatively improved Wilson quarks. A more detailed
discussion of the calculation can be found in [1].
