Multi-CPU system and computer system with the same

Multi-CPU data processing system (100), comprising: a multi-CPU processor (103), comprising: a first CPU (110, 110-1, 110-2), which (at least a first core 111 is configured 113), a first cache (133, 143) and a first cache controller (115), which is configured to (the first cache 133, access 143); and a second CPU (120, 120-1, 120-2), which is configured with at least one second core (121, 123) and a second cache controller (125), which is configured to (a second cache 130, access 140), wherein said first cache (133, 143) from a shared portion of the second cache (130, 140) is configured.