Transmission device and method, recording medium, program, and control device

A transmission method for transmitting data via a communication network, said transmission method comprising:

• requesting transmission of a selected packet to a destination device a route on the communication network to which is determined when an instruction to transmit the selected packet is supplied from an application program or when the selected packet is not stored in a buffer that stores packets disposed in a queue for transmission, while a number of packets stored in the buffer is smaller than a first threshold value;
• determining whether the number of packets stored in the buffer is equal to or smaller than a second threshold value smaller than the first threshold value when the transmission of the selected packet is requested;
• controlling storing of the selected packet in the buffer so as to store the selected packet in said buffer when it is determined that the number of packets stored in the buffer is equal to or smaller than the second threshold value, and so as not to store the selected packet in the buffer when it is determined that the number of packets stored in the buffer exceeds the second threshold value;
• and
• controlling output of the selected packet stored in the buffer to a control program for controlling the transmission of the selected packet by the physical layer hardware based on the queue when the transmission of the selected packet is requested.

A recording medium recorded with a computer readable program for executing a method for transmitting data via a communication network, said transmission method comprising:

• requesting transmission of a selected packet to a destination device a route on the communication network to which is determined when an instruction to transmit the selected packet is supplied from an application program or when the selected packet is not stored in a buffer that stores packets disposed in a queue for transmission, while a number of packets stored in the buffer is smaller than a first threshold value;
• determining whether the number of packets stored in the buffer is equal to or smaller than a second threshold value smaller than the first threshold value when the transmission of the selected packet is requested;
• controlling storing of the selected packet in the buffer so as to store the selected packet in said buffer when it is determined that the number of packets stored in the buffer is equal to or smaller than the second threshold value, and so as not to store the selected packet in the buffer when it is determined that the number of packets stored in the buffer exceeds the second threshold value;
• and
• controlling output of the selected packet stored in the buffer to a control program for controlling the transmission of the selected packet by physical layer hardware based on the queue when the transmission of the selected packet is requested.

A system for transmitting data via a communication network, said system comprising:

• a processor operable to execute instructions;
• and
• instructions for executing a transmission method, the transmission method including:
• requesting transmission of a selected packet to a destination device a route on the communication network to which is determined when an instruction to transmit the selected packet is supplied from an application program or when the selected packet is not stored in a buffer that stores packets disposed in a queue for transmission, while a number of packets stored in the buffer is smaller than a first threshold value;
• determining whether the number of packets stored in the buffer is equal to or smaller than a second threshold value smaller than the first threshold value when the transmission of the selected packet is requested;
• controlling storing of the selected packet in the buffer so as to store the selected packet in the buffer when it is determined that the number of packets stored in the buffer is equal to or smaller than the second threshold value, and so as not to store the selected packet in the buffer when it is determined that the number of packets stored in the buffer exceeds the second threshold value;
• and
• controlling output of the selected packet stored in the buffer to a control program for controlling the transmission of the selected packet by physical layer hardware based on the queue when the transmission of the selected packet is requested.

A control device, comprising:

• requesting means for requesting a process to be performed, and for repeatedly requesting the same process to be performed when the requested process is not performed, wherein the requested process is for storing a selected packet in a buffer for storing packets disposed in a queue for transmission, and wherein the requested process is not performed when the number of packets stored in said buffer exceeds a second threshold value smaller than a first threshold value;
• first performance control means for controlling the performance of the requested process so as to make said requesting means continue requesting the requested process to be performed;
• and
• second performance control means for controlling the performance of another process when said requesting means requests the process to be performed.

A transmission device for transmitting data via a communication network, comprising:

• a buffer operable to store packets disposed in a queue for transmission;
• a requesting unit operable to request transmission of a selected packet to a destination device a route on the communication network to which is determined when an instruction to transmit the selected packet is supplied from an application program or when the selected packet is not stored in said buffer, while a number of packets stored in said buffer is smaller than a first threshold value;
• a determining unit implemented by executing a first program and operable to determine whether the number of packets stored in said buffer is equal to or smaller than a second threshold value smaller than said first threshold value when the transmission of the selected packet is requested by said requesting unit;
• a storing controller implemented by executing a second program and operable to control storing of the selected packet in said buffer so as to store the selected packet in said buffer when said determining unit determines that the number of packets stored in said buffer is equal to or smaller than said second threshold value, and so as not to store the selected packet in said buffer when said determining unit determines that the number of packets stored in said buffer exceeds said second threshold value;
• and
• an output controller implemented by executing a third program and operable to control output of the selected packet stored in said buffer to a control program for controlling transmission of the selected packet by physical layer hardware based on said queue when the transmission of the selected packet is requested by said requesting unit.

A control device, comprising:

• a requesting unit operable to request a process to be performed, and to repeatedly request the same process to be performed when the requested process is not performed, wherein the requested process is for storing a selected packet in a buffer for storing packets disposed in a queue for transmission, and wherein the requested process is not performed when the number of packets stored in said buffer exceeds a second threshold value smaller than a first threshold value;
• a first performance controller operable to control the performance of the requested process so as to make said requesting unit continue requesting the requested process to be performed;
• and
• a second performance controller operable to control the performance of another process when said requesting unit requests the process to be performed.