Abstract: The management of transactions received by a coherency controller is disclosed. A method of an embodiment of the invention is performed by a coherency controller of a plurality of coherency controllers of a node that has a plurality of sub-nodes. The coherency controller receives a transaction from one of the sub-nodes of the node. The transaction may relate to another sub-node of the node. However, the coherency controller nevertheless processes the transaction without having to send the transaction to another coherency controller of the node, even though the sub-node from which the transaction was received is different than the sub-node to which the transaction relates. The plurality of coherency controllers is thus shared by all of the plurality of sub-nodes of the node.

Abstract: Employing a coherency controller having a primary path and at least one secondary path to at least one interconnection network is disclosed. A method of an embodiment of the invention is performed by the coherency controller of a node. The coherency controller determines whether transactions are being properly sent to other nodes of a plurality of nodes of which the node is a part via a primary path. In response to determining that the transactions are not being properly sent to the at least one interconnection network via the primary path, the coherency controller instead sends the transactions to the other nodes via a secondary path.