JP2002051087A - Information processing system and data receiving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information processing system and a data receiving method, with which communication throughput can be improved and communication delay can be reduced by reducing the overhead of data. SOLUTION: In the information processing system, in which a communication means for performing communication processing is connected to an information processor provided with a storage means, the communication means is provided with a means for previously securing a receiving buffer in the storage means before communication processing, a means for managing the address of the receiving buffer and a means for storing received data in the address of the storage means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a communication and information processing system.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing an example of the configuration of a conventional information processing system of this kind. An information processing system 1010 shown in FIG. 5 includes an information processing device 1020, a communication mechanism 1030 for transmitting and receiving data to and from a network, a network interface 1033, and a bus 1023 for connecting them. The information processing device 1020 includes a central processing unit 1021 and a storage device 1022, and the communication mechanism 1030 includes a firmware engine 1031 for performing transmission / reception processing and a reception buffer β 1032.

FIG. 6 is a diagram for explaining the operation of the information processing system 1010 of FIG. In step SB1, the receiving buffer β 1032 receives data from the network. In step SB2, the firmware engine 1031 notifies the central processing unit 1021 of the reception of the data by interruption. In step SB3, the operation on the central processing unit 1021 is performed. The kernel that has received the control information for the reception processing such as the reception data size from the firmware engine 1031, searches for an empty area of the storage device 1022, and finds an empty area where the received data can be stored, in that area. The reception buffer α1024 of the reception data size is secured, the kernel notifies the firmware engine 1031 of the start address of the reception buffer 1024, and step SB4
Then, the firmware engine 1031 transfers the reception data of the reception buffer β1032 to the reception buffer α1024.

In such a conventional receiving method of an information processing system, a receiving buffer of a necessary size is dynamically secured in a storage device based on the received data size for each received data. This method is excellent from the viewpoint of effectively using the memory. However, there is a problem that overhead is increased because a reception buffer is dynamically secured for each reception data, which causes a reduction in communication throughput and an increase in communication delay.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an information processing system and a data receiving method capable of realizing an improvement in communication throughput and a reduction in communication delay by reducing data overhead. .

[0006]

In order to achieve the above object, an information processing system according to the present invention is an information processing system in which communication means for performing communication processing is connected to an information processing apparatus having storage means. Means for pre-allocating a reception buffer in the storage means prior to communication processing, means for managing the address of the reception buffer, and storing received data in the address of the storage means Characterized in that it comprises means for performing

Further, according to the data receiving method of the present invention, in the data receiving method in the communication means of the information processing system in which the communication means for performing the communication processing is connected to the information processing apparatus having the storage means, prior to the reception processing A step of securing a reception buffer in the storage means in advance, a step of managing an address of the reception buffer, and a step of storing received data at the address of the storage means.

According to the present invention, a buffer is reserved in advance, and the buffer is directly managed by the communication means, so that the overhead of the reception processing can be reduced. A reduction in delay can be achieved.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration example of an information processing system of the present invention. The information processing system 10 includes an information processing device 20, a communication mechanism 30 for transmitting and receiving data to and from a network, a network interface 34, and a bus 23 for connecting them. The information processing device 20 and the communication mechanism 30 are connected by a bus 23, and the communication mechanism 30 is connected to a network.

The information processing apparatus 20 includes a central processing unit 21 and a storage device 22. The storage device 22 manages a plurality of reception buffers α24 and a plurality of reception buffers α24 in advance at the time of system initialization. Buffer α management table A25 for storing FIG. 2 is a diagram showing a configuration example of the reception buffer α management table A25. The reception buffer α24 is managed by a reception buffer α management table A25. The reception buffer α management table A25 includes a descriptor 2 in which a pointer indicating the start address of the reception buffer α24 and information indicating the effective data size in the reception buffer α24 are set.
8, a head pointer 26 pointing to the head address of the descriptor of the reception buffer α24 containing no data, and a tail pointer 27 pointing to the head address of the last descriptor of the reception buffer α24 containing data.

As shown in FIG. 1, the communication mechanism 30 includes a firmware engine 31 for performing transmission / reception processing, and a reception buffer β3.
2, and a reception buffer α management table B33 which is a complete copy of the contents of the reception buffer α management table A25. As a result, the firmware engine 31 refers to the reception buffer α management table B33, so that the storage engine 22 of the information processing
The start address of the empty reception buffer α24 can be known.

After receiving the data, the firmware engine 31 performs a DMA transfer to the reception buffer α24 of the descriptor 28 indicated by the head pointer of the reception buffer α management table B33. When the DMA transfer is completed, the firmware engine
31 is a head pointer of the reception buffer α management table B33 and a head pointer of the reception buffer α management table A25.
Increment 26.

The receiving software knows the number of newly received data from the difference between the head pointer 26 and the tail pointer 27 of the receiving buffer α management table A25, and determines from the descriptor following the head pointer 26 to the descriptor of the tail pointer 27. Pass the data to point to the user process. Thereafter, the value of the tail pointer is set to the value of the head pointer minus one.

FIG. 3 is a diagram for explaining the operation of the information processing system 10 of FIG. Storage device in advance by initial setting etc.
A plurality of reception buffers α24 are secured in the storage 22 and information such as addresses and sizes thereof are held in a reception buffer α management table B33 provided in the communication mechanism 30.

In step SA1, the reception buffer β32 receives data from the network. In step SA2, the firmware engine 31 selects an appropriate buffer by referring to the reception buffer α management table B33, and in step SA3, the firmware engine 31 The reception data of the reception buffer β32 is transferred to the reception buffer α24.

As shown in the above embodiment, in the information processing system of the present invention, the reception buffer α24 is reserved in advance, and the firmware engine 31 performs the reception processing using the reception buffer α management table B33, so that the reception overhead is reduced. As a result, the communication throughput can be improved and the communication delay can be reduced.

The above embodiment is an exemplification, and the present invention is not limited to this. The scope of the present invention should be determined by the description of the claims, and modifications other than the above-described embodiments are included in the scope of the present invention unless departing from the spirit of the present invention. For example, in the above embodiment, the case where the size of the reception buffer α24 is only one type has been described, but a plurality of types of reception buffers α24 may be provided in order to correspond to any reception data size. In that case,
As shown in FIG. 4, the reception buffer α management table A25
Include a head pointer 26-1 ..., a tail pointer 27-1 ..., and a descriptor 28-1 ... for each type of buffer.

[0018]

As described above, according to the present invention,
In the reception processing of the information processing system, it is possible to reduce the data overhead and improve the communication throughput and reduce the communication delay.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of an information processing system of the present invention.

FIG. 2 is a diagram illustrating a configuration example of a reception buffer α management table A25.

FIG. 3 is a diagram for explaining an operation of the information processing system 10 of FIG. 1;

FIG. 4 is a diagram showing a modification of the configuration of the information processing system of the present invention.

FIG. 5 is a diagram illustrating a configuration example of a conventional information processing system.

FIG. 6 is a diagram for explaining the operation of a conventional information processing system.

[Explanation of symbols]

 Reference Signs List 10 information processing system 20 information processing device 21 central processing unit 22 storage device 23 bus 24 reception buffer α 25 reception buffer α management table A 26 head pointer 27 tail pointer 28 descriptor 30 communication mechanism 31 firmware engine 32 reception buffer β 33 reception buffer α Management table B 34 Network interface 1010 Information processing system 1020 Information processing device 1021 Central processing unit 1022 Storage device 1023 Bus 1024 Receive buffer α 1030 Communication mechanism 1031 Farm engine 1032 Receive buffer β 1033 Network interface

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Etsuo Masuda 2-3-1 Otemachi, Chiyoda-ku, Tokyo F-term within Nippon Telegraph and Telephone Corporation 5B060 AA06 AC19 5B089 GB01 KA05 KC15 KD01 KD07 5K034 AA02 AA03 FF01 FF02 GG02 HH02 HH49

Claims (2)

[Claims] 1. An information processing system in which communication means for performing communication processing is connected to an information processing apparatus having storage means, wherein the communication means secures a reception buffer in the storage means in advance of the communication processing. An information processing system comprising: means for managing an address of the reception buffer; and means for storing received data at the address of the storage means. 2. A data reception method in a communication unit of an information processing system in which a communication unit for performing a communication process is connected to an information processing apparatus having a storage unit, wherein a reception buffer is stored in the storage unit prior to the reception process. A data receiving method comprising: securing in advance; managing an address of the reception buffer; and storing received data at the address in the storage unit.