In a medium skillet over medium-high heat, stir the eggs, sour cream and butter. Beat the mixture lightly to break up the eggs. Turn the heat down and stir the eggs constantly until very lightly set, but still creamy --about 8 minutes. Stir in the salt and white pepper to taste. Add the dill and smoked salmon and mix well. Continue cooking until the eggs are set to your tastes. Serve immediately.