Method, apparatus, and computer program product for...

Details Method, apparatus, and computer program product for... Method, apparatus, and computer program product for...

2006-08-01

2006-08-01

Trujillo, James K. (Department: 2116)

Electrical computers and digital processing systems: support

Synchronization of clock or timing signals, data, or pulses

C713S401000, C713S500000, C713S502000

Reexamination Certificate

active

07085948

ABSTRACT:
A method, apparatus and computer program product are provided for implementing time synchronization correction in computer systems. A service processor includes a battery-backed hardware clock, and a hypervisor includes a hypervisor system clock. A common timer resource is accessible by the hypervisor and the service processor. To synchronize the battery-backed hardware clock and the hypervisor system clock, the common timer resource is used to measure the latency in the communication medium between the hypervisor and the service processor. The latency is then added onto the time value received in time of day messages between the hypervisor and the service processor for time synchronization correction in the computer systems.

REFERENCES:
patent: 6725278 (2004-04-01), Gonzalez
patent: 6763476 (2004-07-01), Dangi et al.
patent: 2003/0123491 (2003-07-01), Couillard

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