Fujitsu Corporation

Jeremy J Farrell

Patrick N Conway

Kazunori Masuyama

Sudheer Miryala

Takeshi Shimizu

Hitoshi Oi

Toshio Ogawa

Martin Sodos

Yasushi Umezawa

Yukio Nishimura

Norio Kaido

Prabhu Murthy

A system and method for fault containment and error handling within a domain in a partitioned computer system includes a system manager having read and write access to a resource definition table. The system manager is adapted to quiesce the system when failure occurs within a domain, identify an allocated resource associated with the failed domain, identify a non-failed domain, and exit the quiesce mode for the non-failed domain, thereby containing a failure within the failed domain. The system manager further handles an error within the failed domain by deallocating a resource allocated to the failed domain so that the resource becomes available to non-failed domains.

Fault containment and error handling in a partitioned system with shared resources

A system and method for passing messages between domains with low overhead in a multi-node computer system. A CPU node in a sending domain issues a request to a memory node in a receiving domain using memory-mapped input/output window. This causes the message to be transmitted to a coherent space of the receiving domain. All messages are cache-line in size. A small portion of each cache line, cyclic counter field, is overwritten before the cache line is written in the coherent address space of the receiving domain. A massaging driver polls the cyclic count field of the cache line in the processor cache to determine when the next message is written in the coherent address space of the receiving domain. This allows the CPU to detect when the last received message is written into the coherent address space of the receiving domain without generating transactions on CPU interface.

System and method for low overhead message passing between domains in a partitioned server

A mechanism for balancing message traffic in a multi-chassis fully interconnected computer system partitioned into multiple domains allows the system to identify I/O transactions, to route I/O transactions over inter-domain cables, and to route non-I/O transactions over intra-domain cables. This beneficially reduces message traffic congestion on intra-domain cables.

Routing mechanism for static load balancing in a partitioned computer system with a fully connected network

A domain partitioning system for a multi-node computer system is disclosed. An external server manager is coupled to a domain configuration unit by a dedicated sideband channel. The server manager has write privileges to the domain configuration unit that allows the server manager to control the domain partitioning and the routing tables. None of the domains of the computer system are permitted write access to the domain configuration unit. In one embodiment, the domain configuration unit is a set of domain partition registers and routing table registers coupled to a system interconnect.

System and method for partitioning a computer system into domains

In a distributed multi-node computer system each switch provides routing of data packets between CPU nodes, I/O nodes, and memory nodes. Each switch is connected through a corresponding I/O node to a network interface controller (NIC) for transferring data packets on a network. Each NIC is memory-mapped. Part of the system address space forms a send window for each NIC connected to a corresponding switch. A mechanism for controlling data packets transmission is defined such that each CPU write to a NIC send window is atomic and self-defining, i.e., it does not rely on immediately preceding write to determine where the data packet should be sent. Using 'address aliasing', CPU writes to the aliased part of the NIC send window are always directed to the NIC connected to the same switch as the CPU which did the write.

Mechanism to improve performance in a multi-node computer system

A system and method of logically partitioning shared memory structures between computer domains is disclosed. In one embodiment, each domain is assigned a unique address space identifier. The unique address space identifier preferably has tag extension and index extension bits. This permits the tag and index bits of a conventional local domain address to be extended with tag extension and index extension bits. Data entries in the shared memory structure may be accessed using an extended index value. Hits may be determined using an extended tag value.

Method and system for logical partitioning of cache memory structures in a partitoned computer system

A multi-node computer system includes a plurality of I/O nodes, CPU nodes, memory nodes, and hybrid nodes connected via an interconnect. A CPU node or an I/O node issues a request. An address decoder residing in the interconnect decodes the request to determine whether the request is a coherent memory request. The address decoder also determines a physical destination node address of the request based on a logical node address stored in the request.

Growing community of inventors

Campbell, CA, United States of America

Jeremy J Farrell