Method and system for requester virtual cut through

• US 8,879,579 B2
• Filed: 08/23/2011
• Issued: 11/04/2014
• Est. Priority Date: 08/23/2011
• Status: Active Grant

• Current Assignee: Oracle International Corporation (Oracle Corporation)
• Original Assignee: Oracle International Corporation (Oracle Corporation)
• Inventors: Bugge, Haakon Ording, Huse, Lars Paul, Toerudbakken, Ola
• Primary Examiner(s): MARCELO, MELVIN C
• Application Number:
  US13/215,377
• Publication Number:
  US 20130051406A1
• Time in Patent Office: 1,169 Days
• Field of Search: 370/470, 370/471
• US Class Current: 370/471
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 47/36 by determining packet size, e.g. maximum transfer unit [MTU]
• CPC Class Codes: H04L 47/365 Dynamic adaptation of the packet size

Abstract

A method for transmitting a message includes a communication adapter receiving, from a transmitting device, a request to send the message. The method further includes modifying a maximum transfer unit (MTU) to obtain a modified MTU, transmitting, from the communication adapter to a receiving system, a first sub-unit of the message using the modified MTU, iteratively increasing the MTU for transmitting intermediate sub-units of the message until an MTU limit is reached, and transmitting, to the receiving system, the intermediate sub-units of the message. The intermediate sub-units are transmitted after the first sub-unit and before a second sub-unit. The method further includes transmitting, from the communication adapter to the receiving system, the second sub-unit to the receiving system using a full path MTU.

Claims

1. A communication adapter comprising:

a buffer configured to store a first sub-unit and a second sub-unit of a message;

transmitting process logic operatively connected to the buffer, comprising;

a collect buffer unit module configured to receive, from a transmitting device, a request to send the message;

a virtual kick module configured to temporarily store the request once the request is entirely received;

a queue pair fetch module configured to obtain, from the transmitting device, a queue pair status information corresponding to the request;

a direct memory access (DMA) module configured to obtain the message from a location in memory of the transmitting device, wherein the location is specified in the request,

a sub-unit builder module configured to;

modify a maximum transfer unit (MTU) to obtain a modified MTU;

divide the message to obtain the first sub-unit based on the modified MTU;

iteratively increase the MTU for transmitting a plurality of intermediate sub-units of the message until an MTU limit is reached to obtain a plurality of iteratively increased MTUs; and

divide the message to obtain the plurality of intermediate sub-units using the plurality of iteratively increased MTUs; and

a port configured to;

transmit, to a receiving system, the first sub-unit of the message using the modified MTU;

transmit, to the receiving system, the plurality of intermediate sub-units of the message, wherein the plurality of intermediate sub-units are transmitted after the first sub-unit and before the second sub-unit; and

transmit, to the receiving system, the second sub-unit to the receiving system using a full path MTU.

2. The communication adapter of claim 1, wherein the communication adapter is a host channel adapter.

3. The communication adapter of claim 1, wherein the sub-unit builder module is further configured to:

after the second sub-unit is transmitted, iteratively decrease the MTU for transmitting remaining sub-units of the message.

4. The communication adapter of claim 1, wherein the sub-unit builder module is further configured to:

select the modified MTU to use for transmitting the message based on a size of the message.

5. The communication adapter of claim 1, wherein the sub-unit builder module is further configured to encode the modified MTU in the first sub-unit.