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Credit packet-based active transmission method for data center

A transmission method and data packet technology, which is applied in the field of computer network system and network data transmission, can solve the problem of damage to transmission performance, and achieve the effect of reducing short-stream transmission delay, high throughput, and short bounded queue

Active Publication Date: 2021-03-02
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When SCA protocols reach near-zero queue lengths, they cannot effectively cooperate with traditional flow scheduling methods
Short latency sensitive streams and elephant streams are treated equally, which can hurt the performance of their transport

Method used

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  • Credit packet-based active transmission method for data center
  • Credit packet-based active transmission method for data center
  • Credit packet-based active transmission method for data center

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] In order to better understand the contents of the present invention, an example is given here.

[0034] Credits are used to schedule data transmission within link capacity, including single-hop credits, end-to-end credits, and hop-by-hop credits. Single-hop credit refers to the transfer of credit between two devices, and it is usually deployed at the link layer to ensure that data between two switches is not lost. The active transmission protocol adopts the end-to-end credit mechanism, which schedules the data transmission between the sending end and the receiving end, such as pHost, Homa, and NDP. This credit can only prevent congestion at the receiving end, because it only feeds back information about the receiving rate of the host. Hop-by-hop credits can feed back the maximum data transmission rate of each hop from the receiving end to the sending end, and further prevent congestion at each hop by limiting the sending end to send data within the rate range, such as ...

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Abstract

The invention discloses an active transmission method based on a credit packet for a data center. The method comprises the steps that a sending end records the size of a data stream requested by the credit packet and sends the data stream to a receiving end; when the receiving end receives the credit data packet, the sending end copies the credit serial number of the receiving end to the corresponding data packet and sends the data packet to the receiving end; after the data packet is sent, the sending end updates the flow remaining length of the corresponding flow by subtracting the size of the sent credit data packet; for the switch, each switch port limits the credit speed to 5% of the link speed, and if the credit size exceeds the link capacity, the credit data packet is discarded; andthe priority scheduling is enabled in the credit queue, and when the credit queue is full, the switch will discard the lowest priority credit. According to the invention, the short flow credit sending rate of the receiving end is effectively improved, and compared with the current common SCA transmission, the short flow transmission delay and the average FCT under the actual working load are reduced.

Description

technical field [0001] The invention relates to the fields of computer network system and network data transmission, in particular to an active transmission method based on credit packets used in data centers. Background technique [0002] The internal data traffic of the data center is large and bursty, and its internal data traffic is mainly composed of short delay sensitive messages and some large traffic. However, current data center switch buffers are very shallow, and this typical mix of traffic is likely to cause network congestion when buffer occupancy becomes too high. Once congestion occurs, data queuing and packet loss will seriously affect the flow completion time of small traffic, and affect the throughput of large traffic, further affecting user experience. To improve network performance, many methods have been proposed to manage congestion. [0003] In today's high-speed data centers, more and more flows can be done in one round trip time (RTT). Because rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/801H04L12/823H04L12/865H04L47/32H04L47/6275
CPCH04L47/39H04L47/6275H04L47/12H04L47/32
Inventor 董德尊黄山周泽嘉杨文祥徐金波张建民李存禄
Owner NAT UNIV OF DEFENSE TECH
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