rescale texture

how should i resize textures when using cycles, i tried material maps, no effect.
With my object i do a uv unwrap then assign a file texture as color for a difuse node…
from somewhere there i like to rescale the texture … but how to do it ?

Add a mapping node and then rescale there

but it doesnt seam to have effect ? despite ive unwrapped it.

Share a blend as example or at the very least show some screen shots with all the info possible so we can figure this out. Might be something simple being overlooked, or it could be a weird case situation.