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Pre-empting low-priority traffic with high-priority traffic

A high-priority and priority technology, applied in digital transmission systems, data exchange networks, electrical components, etc., can solve problems such as delaying normal code processing

Inactive Publication Date: 2009-12-23
CISCO TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An interrupt causes the software to begin executing another code stream, delaying normal code processing

Method used

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  • Pre-empting low-priority traffic with high-priority traffic
  • Pre-empting low-priority traffic with high-priority traffic
  • Pre-empting low-priority traffic with high-priority traffic

Examples

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Embodiment Construction

[0019] Reference will now be made in detail to various embodiments of the invention. Examples of these embodiments are shown in the accompanying drawings. While the invention will be described in conjunction with these embodiments, it will be understood that it is not intended to limit the invention to any embodiment. On the contrary, the intention is to cover all alternatives, modifications and equivalents as included within the spirit and scope of the invention as defined by the appended claims. In the following description, numerous specific details are set forth in order to provide a thorough understanding of various embodiments. However, the present invention may be practiced without some or all of these specific details. In other instances, well known process operations have not been described in detail so as not to unnecessarily obscure the present invention.

[0020] The first embodiment will now be described in the case of a supervisor ASIC (Application Specific In...

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Abstract

A method and system for pre-empting a low-priority traffic with high-priority traffic over a serial link utilizes special codes to delimit a high-priority message embedded within a low-priority message.

Description

Background technique [0001] In many systems, dedicated links carry both low-priority and high-priority traffic. Low-priority traffic may be longer, causing high-priority traffic to suffer a greater-than-acceptable amount of latency. [0002] A software example of this type of latency is the interrupt handling of a microprocessor. An interrupt causes software to begin executing another code stream, delaying normal code processing. [0003] A hardware example of this is the PCI bus "wait timeout" protocol, where a central arbiter can force a bus master off the shared bus to allow another master to perform a transaction. [0004] In software and hardware examples, the time to switch to an interrupt transaction can be arbitrary and quite long. Therefore, there is a need for improved faster techniques for switching from low priority traffic to high priority traffic on dedicated links. Contents of the invention [0005] According to one aspect of the invention there is provide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56
CPCH04L47/245H04L47/10
Inventor 迈克尔·理格尔詹姆斯·理沃斯
Owner CISCO TECH INC
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