| US 7,581,033 B2 | ||
| Intelligent network interface card (NIC) optimizations | ||
| Dwayne E. Ebersole, Lancaster, Pa. (US); Sarah K. Inforzato, Downingtown, Pa. (US); Robert A. Johnson, Pottstown, Pa. (US); Anthony Narisi, Glenmoore, Pa. (US); and Kathleen Wild, Collegeville, Pa. (US) | ||
| Assigned to Unisys Corporation, Blue Bell, Pa. (US) | ||
| Filed on Dec. 05, 2003, as Appl. No. 10/729,312. | ||
| Prior Publication US 2009/0172301 A1, Jul. 02, 2009 | ||
| Int. Cl. G06F 15/16 (2006.01) | ||
| U.S. Cl. 709—250 [709/223; 709/224; 709/228; 710/5; 710/39; 710/311] | 8 Claims |
| 1. A host computer system comprising:
a first processor;
a first memory;
a data storage device, the data storage device having an operating system stored thereon, the operating system executable
by the first processor, the operating system creating an environment in which an application runs, the application communicating
with a destination;
a send work queue, stored in the first memory, the send work queue comprising at least one send work queue entry, each send
work queue entry comprising at least one of a descriptor and a control-path command;
a receive work queue, stored in the first memory, the receive work queue comprising at least one receive work queue entry,
each receive work queue entry comprising at least one of a descriptor and a control-path command;
a Network Interface Card (NIC), the NIC comprising a port through which the application communicates with the destination,
the NIC further comprising a second memory and a second processor;
a token table, stored in the first memory and associated with said NIC, the token table communicating descriptors and control-path
commands from the send work queue and receive work queue to the NIC;
a Notification Request Area (NRA), stored in the second memory, the NRA allowing the NIC to notify the operating system that
a descriptor has completed;
a Master Completion Queue (MCQ), the MCQ being stored in the first memory and being associated with at least one of the send
work queue and the receive work queue, the MCQ comprising the completion status of descriptors posted to the associated work
queue;
a Memory Deregistration List (MDL), the MDL being stored in the second memory, the MDL containing memory handles to be deregistered;
an MDL Insert Kernel Agent counter running in the operating system, which indicates where in the MDL a next deregistered memory
handle should be inserted;
a Memory Region Table (MRT), the MRT being stored in the first memory and maintained by the MDL Insert Kernel Agent, containing
all registration information for all memory regions registered on the NIC; and
a shadow MRT, the shadow MRT being stored in the second memory, which is a copy of the MRT entries for said NIC.
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