Danny Otus Neal

US Patent:

7095750, Aug 22, 2006

Filed:

Aug 16, 2001

Appl. No.:

09/931295

Inventors:

David F. Craddock - New Paltz NY, US
Danny Marvin Neal - Round Rock TX, US
Gregory Francis Pfister - Austin TX, US
Renato John Recio - Austin TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04L 12/28
H04L 12/56

US Classification:

370412, 370465

Abstract:

Apparatus and method for virtualizing a queue pair space to minimize time-wait impacts. Virtual queue pairs are allocated from a virtual queue pair pool of a node to connections between the node and other nodes. The connection is established between a physical queue pair of the node and physical queue pairs of other nodes. From the viewpoint of the other nodes, they are communicating with the present node using the virtual queue pair and not the physical queue pair for the present node. By using the virtual queue pairs, the same physical queue pair may accommodate multiple connections with other nodes simultaneously. Moreover, when a connection is torn down, the virtual queue pair is placed in a time-wait state rather than the physical queue pair. As a result, the physical queue pair may continue to function while the virtual queue pair is in the time-wait state.

US Patent:

58840532, Mar 16, 1999

Filed:

Jun 11, 1997

Appl. No.:

8/873347

Inventors:

Paul L. Clouser - Stamford CT
Richard Allen Kelley - Apex NC
Danny Marvin Neal - Round Rock TX
Charles Bertram Perkins - Cedar Park TX

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1300

US Classification:

395306

Abstract:

An enhanced PCI bus architecture utilizing differential signaling is supported by an adapter slot connector providing differential signaling pins and a make-before-break connection between bus conductors and dummy loads for each bus conductor, enabling higher frequency and higher bandwidth operation. The dummy loads simulate the signal load of an adapter inserted into the slot. The PCI bus conductors are automatically disconnected from the dummy loads and connected to the adapter pins when an adapter is inserted into the slot. A balanced load bus is thus provided regardless of whether adapter slots are populated or empty.