The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 31, 2012
Filed:
Jan. 22, 2009
Eric A. Anderson, Palo Alto, CA (US);
Eric A. Anderson, Palo Alto, CA (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A system and method for measuring clock skew in a network is disclosed. The method comprises sending an echo message at a periodic rate from a plurality of servers in the network to an anchor server. A reply message can be sent from the anchor server to each server that includes a remote timestamp based on the anchor server clock. The remote timestamp can be recorded at each of the servers. A send timestamp that designates a time the echo message was sent and a receive timestamp that designates a time the reply message was received at the server can then be recorded. An estimated clock time of each server may also be calculated relative to the anchor server using the send and receive timestamps. A clock skew value can be determined by subtracting the estimated clock time of each server from the remote timestamp time. Interpolation can then performed between the clock skew values over a selected portion of the period of time to enable clock skew values to be estimated over the selected portion of time.