Invention Grant
US07660251B2 Method and apparatus for hierarchial scheduling of virtual paths with underutilized bandwidth
有权
具有未充分利用带宽的虚拟路径的层次调度的方法和装置
- Patent Title: Method and apparatus for hierarchial scheduling of virtual paths with underutilized bandwidth
- Patent Title (中): 具有未充分利用带宽的虚拟路径的层次调度的方法和装置
-
Application No.: US12044994Application Date: 2008-03-09
-
Publication No.: US07660251B2Publication Date: 2010-02-09
- Inventor: Lyle Edwin Grosbach , Glen Howard Handlogten , James Francis Mikos , David Alan Norgaard
- Applicant: Lyle Edwin Grosbach , Glen Howard Handlogten , James Francis Mikos , David Alan Norgaard
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agent Joan Pennington
- Main IPC: H04L12/26
- IPC: H04L12/26

Abstract:
A method and apparatus are provided for implementing hierarchical scheduling of oversubscribed virtual paths with underutilized bandwidth that works for both ATM (cell) and IP (frame) scheduling. A scheduler includes a first calendar for pipes and autonomous flows and a second calendar for pipe flows. A winner of a pipe or an autonomous flow is identified from the first calendar. Responsive to an identified winner pipe, a pipe queue is checked for an associated pipe flow for the winner pipe. Responsive to identifying an empty pipe queue for the winner pipe, a pipe win credit is assigned to the pipe without reattaching the winner pipe to the first calendar. Then a next winner is identified from the first calendar. When a winner pipe flow is identified from the second calendar and the pipe win credit is assigned to the pipe for the winner pipe flow, then the winner pipe flow is serviced without delay.
Public/Granted literature
- US20080159297A1 METHOD AND APPARATUS FOR HIERARCHIAL SCHEDULING OF VIRTUAL PATHS WITH UNDERUTILIZED BANDWIDTH Public/Granted day:2008-07-03
Information query