JP2006287293A - Method of bringing efficiency to data transfer, and system employing the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of attaining efficient data transfer processing of a transmission side control section. <P>SOLUTION: A host 10 acting like a transmission side apparatus is provided with a plurality of buffer memories 13-x, when a transmission control section 14 transfers first data from the buffer memory 13-1, the control section 14 immediately generates a pseudo response, so as to make next transfer data to be storable when the buffer memory 13-2 is idle, thereby capable of promoting a data transfer preparation including memory processing in the host 10 applied to the next transfer data even when there arises a delay in the response for informing of the end of data processing due to congestion of the first data on a network 20, re-transmission of the transfer data from a receiver side terminal 30, and collision of processing in the terminal 30 or the like. That is, bringing efficiency to data transfer can be attained. A prefetch information management section 15 manages the information associated with the pseudo response that is stored in a prefetch information memory 16 as prefetch information under the control of the transfer control section 14. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for improving transfer efficiency when transferring data using a plurality of buffer memories.

  Examples of conventional data transfer efficiency improving systems include those disclosed in Japanese Patent Laid-Open No. 04-280542 (Patent Document 1) or Japanese Patent Laid-Open No. 11-088464 (Patent Document 2).

  Patent Document 1 will be described with reference to FIG. 7, for example.

  In order to improve data transfer efficiency, the transmission-side device 110 collectively transmits data of the maximum number of frames stored in a plurality of buffer memories and set in advance to the reception-side device 130 by the transfer control unit 113. However, when the communication processing performance of the receiving side device 130 is low, or when there is no room in the buffer memory, a retransmission request is received for the data frame transferred by the transfer control unit 113 of the transmitting side device 110. The transfer control unit 113 monitors the frequency of occurrence of this retransmission request, and reduces the maximum number of frames to be transmitted when a retransmission request occurs at a certain frequency or more. As described above, the transmission-side apparatus 110 optimizes the maximum number of frames to reduce the occurrence of retransmission requests by changing the maximum number of frames to be transmitted in a batch based on the frequency of occurrence of retransmission requests.

  Here, the procedure in the normal operation will be described with reference to FIG. 7 and the sequence chart of FIG.

  The data processing unit 111 of the transmission side device 110 stores the data in the buffer memory 112, and instructs the transfer control unit 113 to transfer the data when the data reaches the preset maximum number of frames (step S101). To do. The transfer control unit 113 transfers a predetermined amount of data to the reception control unit 131 of the transfer destination receiving device 130 (step S102).

  In the reception side device 130, the reception control unit 131 accepts the data (step S103) and stores it in the buffer memory 132. The data processing unit 133 processes the received data, deletes the processed data from the buffer memory 132, makes it empty (step S104), and notifies the reception control unit 131 of this. The reception control unit 131 sends the end of normal processing of the transfer data to the transmission control unit 113 of the transmission source by a predetermined response signal (step S105).

  In the transmission side device 110, the transfer control unit 113 receives the response signal (step S106) and sends it to the data processing unit 111. Accordingly, the data processing unit 111 accepts this (procedure S107), erases the data in the buffer memory 112, and displays a free space (procedure S108). As a result, space is generated in the buffer memory 112, so the data processing unit 111 stores the next predetermined amount of data in the buffer memory 112 (step S109), and instructs the transfer control unit 113 to transfer the data (step S201). To do. This procedure S201 is to return to the procedure S101, and the following procedure is repeated.

  In such a configuration, when the transmission side device 110 continuously transfers data, the buffer memory 112 is blocked during the period from the data transfer in step S102 to the reception side response acceptance in step S107. Cannot transfer data. Furthermore, since a delay due to congestion in the network 120 is also included during this period, a delay in data transfer that follows is inevitable. Further, when the transmission side device 110 continuously transfers data to the same reception side device 130, for example, the time gap from the above step S104 to the next step S204 in the data processing unit 133 of the same reception side device 130 can be avoided. Absent.

  Furthermore, in this Patent Document 1, when receiving the transfer data in the above step S103 on the receiving side, the transfer data cannot be received due to a lack of free space in the buffer memory 132, and the performance difference from the receiving side is not achieved. However, there are many opportunities to request retransmission. In the process of optimizing the maximum number of frames, a further delay in data transfer is unavoidable due to the generation of a retransmission request or the expansion of the maximum number of frames when conditions are relaxed.

  Further, in Patent Document 2, when data for one track is divided into a plurality of packet data and stored in a plurality of buffer memories, in the transmission side device 110, if the transfer control unit 113 has an empty transmission buffer, The transfer data is stored and transmitted sequentially without waiting for a response. When the transfer control unit 113 receives a normal reception response to the transmission data, the transfer control unit 113 clears the corresponding data. In the case of an abnormal reception response, the transfer control unit 113 starts from the data of the abnormally received packet instead of all the data for one track. Resend subsequent data. Therefore, the receiving side device 130 discards only the data received after the abnormally received data and receives the abnormal data again in response to the processing on the transmitting side. As described above, even for the batch transmission track data, the retransmission of the packet data normally received before the detection of the abnormality is not required, thereby improving the efficiency of the data transfer.

  However, even in the data transfer process as in Patent Document 2, as in Patent Document 1, in the case of normal data transfer and continuous data transfer from the transmission side, all of the previous transfer data is transferred to the reception side. Since the next data transfer instruction cannot be started unless the transfer ends normally, a delay in data transfer cannot be avoided.

Japanese Patent Laid-Open No. 04-280542 Japanese Patent Laid-Open No. 11-088464

  In the conventional data transfer efficiency improvement method described above, in order to improve the data transfer efficiency, an abnormality that the transmission side receives from the reception side by continuously transferring a plurality of frames or packets stored in a plurality of buffer memories. A data transfer efficiency improvement system corresponding to a retransmission request based on the above is described. However, on the transmission side, the delay due to the retransmission request on the network, as well as the delay due to congestion in normal transfer, the delay based on the performance difference between the transmission side and the reception side, the data processing delay at the reception side device, etc. Delay due to response delay from the receiving side cannot be avoided.

  The problem to be solved is to enable efficient data transfer that eliminates the cause of delay that has conventionally occurred when the transmitting device transfers data to the receiving device.

  The present invention aims at avoiding a response delay from the receiving side device when the transmitting side device transfers data to the receiving side device, and the transmitting side includes a plurality of buffer memories and receives data from the buffer memory. The main feature is that when the data is transferred to the side, a pseudo response is immediately generated to proceed to the next data transfer procedure. The next data transfer procedure is a procedure for storing the next transfer data in the empty area and transferring it to the receiving side when there is more free space in the buffer memory.

  With such a configuration, the transmission side can continue the next data transfer until the buffer memory is full without waiting for a response from the reception side. During this time, if there is a normal transfer end response, the corresponding buffer memory can be made empty and usable.

  Therefore, on the transmission side, the pseudo response is recorded in the buffer memory to which data has been transferred. When a normal end response is received from the receiving side, the data stored in the target buffer memory together with the pseudo response can be erased to make the buffer memory empty.

  Furthermore, when the receiving side has a plurality of buffer memories and receives a status inquiry for data transfer from the transmitting side, it answers the availability status in the buffer memory, and the transmitting side returns data based on the availability status. Transfer is preferable because retransmission due to lack of free space can be prevented.

  Furthermore, on the transmission side, status inquiries to the reception side can be made periodically at a predetermined time, and the transfer commands generated can be transferred collectively as a transfer command group by this time.

  Further, the transmission side device stores a plurality of buffer memories for storing transfer data, a transmission side control unit for storing the transfer data when the buffer memory is empty, and instructing the transfer, and the transfer command. Receiving and transferring data from the buffer memory, and at the time of the transfer, a transfer control unit that immediately generates a pseudo response and notifies the transmission side control unit of the pseudo response, and the transmission side control unit includes: If the buffer memory is empty when the pseudo response is received, the next data transfer is instructed and the transfer data is stored in the empty buffer memory.

  Further, the pseudo-response generated by the transfer control unit is received and stored in association with the target buffer memory. When a normal response corresponding to the pseudo-response is received from the transfer control unit, the pseudo-response is stored in the target buffer memory. It is preferable to further include a prefetch information management unit that erases stored data to make it empty, in order to keep the configuration of the transmission side control unit as in the past and simplify the control of the transfer control unit.

  The data transfer efficiency improvement method of the present invention comprises a plurality of buffer memories on the transmission side, and immediately generates a pseudo-response when data is transferred from the buffer memory, and the next transfer is performed when the buffer memory is free. Since data can be stored, the next data transfer command can be performed using an empty buffer memory even between data transfer and processing, so there are more transfer commands to the receiving side. It is possible to reduce the load on the network.

  Furthermore, it is possible to perform more efficient data transfer by enabling free memory status notification between the transmitting and receiving apparatuses.

  For the purpose of avoiding a response delay from the reception side device when the transmission side device transfers data to the reception side device, the transmission side has a plurality of buffer memories, and when data is transferred from the buffer memory, This is achieved without changing the receiving side by immediately generating a pseudo-response and making it possible to store the next transfer data when the buffer memory is free.

  Further, in the transmission side device, the peripheral control unit of the interface part with the reception side including the transfer control unit and the buffer memory is provided with an information management unit that processes the pseudo response, so that the purpose can be achieved only with a small change of the transfer control unit. Could be achieved. Further, the receiving side is provided with a plurality of receiving side buffer memories, and by adding a function of notifying the transmitting side of the empty buffer status on the receiving side, it is possible to further improve the data transfer efficiency.

  A normal operation part according to the first embodiment of the present invention will be described with reference to FIG. For abnormal operations, conventional techniques are used, such as enabling fault tracing by stopping and holding the state upon detection of an abnormality, and description thereof is omitted here. Also, with respect to the part of normal operation, illustration and description of parts other than those according to the present invention are omitted. In the drawings, the buffer memory is also abbreviated as a buffer for the sake of space.

  FIG. 1 is an explanatory diagram showing an embodiment of functional blocks in the data transfer efficiency improvement system of the present invention. In FIG. 1, a host computer (hereinafter abbreviated as “host”) 10 is connected to a network 20 as a transmission side device, and a terminal device 30 is connected as a reception side device.

  The host 10 includes a transmission side control unit 11 and a peripheral control unit 12. The peripheral control unit 12 includes two groups of buffer memories 13-1 and 13-2, a transfer control unit 14, and a prefetch information management unit 15, and the prefetch information management unit 15 has a prefetch information memory 16.

  The terminal device 30 includes a reception control unit 31, a prefetch information management unit 32, two groups of buffer memories 33-1 and 33-2, and a terminal control unit 34, and the prefetch information management unit 32 stores the prefetch information memory 35. Have.

  The difference from the conventional system described above is that two groups of buffer memories are provided on each of the transmission side and the reception side. Actually, of the plurality of buffer memories, the next pointer used in the first instruction is used as the second instruction, and the second instruction is used when the buffer memory for the first instruction becomes empty. In the group division, the next pointers used in step 1 can be used alternately so as to be the first instruction. However, in order to simplify the description, it will be described simply as two fixed buffer memories.

  The transfer control unit 14 and the prefetch information management unit 15 of the peripheral control unit 12 and the reception control unit 31 and the prefetch information management unit 32 of the terminal device 30 perform the exchange of information regarding the prefetching of instructions, for example, at startup and periodically. Assume that each prefetch information memory 16 and prefetch information memory 35 store and update the information. The instruction prefetch information includes, for example, the size of each transmission / reception buffer, the size of processed / unprocessed data, processing time, retransmission information, and the like. Based on this instruction prefetch information, a change in processing performance due to a load state between the peripheral control unit 12 and the terminal device 30 is reflected in management of the buffering size and the like.

  When the transmission side control unit 11 has the transfer data, the transmission side control unit 11 sends the transfer data held in accordance with the instruction request received from the peripheral control unit 12 to the designated buffer memory 13-x together with the instruction of the transmission destination and the like, and a response related to the transfer data In response, the next data transfer is enabled. That is, the transmission-side control unit 11 can be operated with only a slight addition of functions compared to the conventional one. The transfer data and its transfer command can collectively process a plurality of command groups generated when a command request is received according to the free capacity of the buffer memory.

  In the peripheral control unit 12, the transfer control unit 14 stores an instruction and transfer data received by requesting the transmission side control unit 11 by designating an empty buffer memory 13-1, for example, in the buffer memory 13-1. Immediately, a pseudo response is sent to the transmission side control unit 11 and the prefetch information management unit 15. It is assumed that the transfer control unit 14 sends a transfer command request to the transmission side control unit 11 when acquiring the transfer command request as instruction prefetch information from the reception side, for example.

  As described above, the transfer control unit 14 exchanges the instruction prefetch information with the terminal device 30 periodically, for example, and holds the prefetch information in the prefetch information memory 16. I know. Also, when the transfer control unit 14 receives a normal end response from the terminal device 30 due to the end of normal data transfer, the transfer control unit 14 sends it to the prefetch information management unit 15 and deletes the corresponding stored data to make it empty. .

  The transfer control unit 14 stores the transfer data in the buffer memory 13-1 and sends a pseudo response to the transmission-side control unit 11. After that, if the buffer memory 13-2 is empty, the transfer control unit 14-2 continues. And a command request for the next transfer data can be sent to the transmission side control unit 11.

  When receiving a pseudo response from the transfer control unit 14, the prefetch information management unit 15 stores the corresponding buffer memory information in the prefetch information memory 16 and holds it until a normal response is received from the transfer control unit 14. The prefetch information management unit 15 is interposed between the buffer memory 13-x and the transfer control unit 14, so that the transfer control unit 14 can be operated almost by a conventional function.

  In the terminal device 30, the reception control unit 31 is connected to the host 10 via the network 20. The reception control unit 31 obtains information from the prefetch information management unit 32 and the buffer memory 33-x, and exchanges information regarding prefetching with the host 10 at, for example, startup and periodically, and uses the buffer of the host 10 I know.

  The reception control unit 31 stores the command and data received from the host 10 in the designated buffer memory 33-1, for example, and notifies the terminal control unit 34 of it. When receiving the data processing end notification from the terminal control unit 34, the reception control unit 31 deletes the data in the corresponding buffer memory 33-x and sends a normal end response to the host 10.

  When the terminal control unit 34 receives a data storage notification from the reception control unit 31 to the buffer memory 33-x, the terminal control unit 34 extracts and processes the data, and notifies the end thereof. The terminal control unit 34 executes the next process after one process is completed.

  Next, an operation sequence in the smooth state in FIG. 1 will be described with reference to FIGS. 2A and 2B showing features according to the present invention.

  First, it is assumed that the host 10 holds the transfer data generated by the transmission side control unit 11 and is in a transfer standby state.

  In the peripheral control unit 12, the transfer control unit 14 periodically inquires and acquires the reception status of the terminal device 30 in the first embodiment. At this time, the transfer control unit 14 requests a transfer command to the transmission side control unit 11 due to the empty space in the buffer memory 13-1 (step S1). In accordance with the data transfer command request received from the peripheral control unit 12, the transmission-side control unit 11 sends the first transfer data together with the command to the peripheral control unit 12 (step S2).

  In the peripheral control unit 12, the transmission-side control unit 11 stores the received data in the buffer memory 13-1 based on the command (step S3), while transferring the data to the terminal device 30 via the network 20 ( Step S4). The transmission side control unit 11 sends a pseudo response to the transmission side control unit 11 without waiting for a process end response in the conventional procedure for data transfer (step S5). This related information is sent to the prefetch information management unit 15 and stored in the prefetch information memory 16.

  In the terminal device 30 that has received the transfer data from the host 10, the data received by the reception control unit 31 is stored in the buffer memory 33-1 (step S6), and this is notified to the terminal control unit 34. The terminal control unit 34 receives and processes the data stored in the buffer memory 33-1 (step S7).

  When the control unit 31 receives a notification of the end of the processing of the first data (procedure S7F) from the terminal control unit 34, the control unit 31 erases the stored data in the first buffer memory 33-1 and sends a processing end response to the host 10. Sending out (step S8). In the host 10, the peripheral control unit 12 receives the end response and erases the record of the stored data in the first buffer memory 13-1 and the corresponding information including the command of the prefetch information memory 16 (step S 9). The free space in the buffer memory 13-1 is displayed (step S9F).

  The pseudo response sent in step S5 described above is processed as a conventional regular response by the transmission side control unit 11. That is, when the second transfer data is generated after the transfer command in step S2 (step S10), the transmission-side control unit 11 displays the empty space in the second buffer memory 13-2 from the peripheral control unit 12. On the basis of this, it is possible to send a second data transfer command (procedure S12) upon receiving a scheduled transfer command request (procedure S11). The subsequent steps up to step S16 are the same as the steps up to step S6 for the first transfer data, and a description thereof will be omitted.

  As described above, conventionally, even if the second buffer memory 13-2 is empty, the process of the next transfer data cannot be started unless the process up to step S9F is completed. When the pseudo response occurs, a data transfer command can be sent out.

  If the terminal device 30 is the same as the first data transfer destination in step S16, the data stored in the second buffer memory 33-2 is processed after the end of the first data processing in step S7F. However, when the first and second data transfer destinations are different, the data processing is completed quickly.

  In addition, although the transmission side control unit 11 receives a pseudo response to the second transfer data, the peripheral control unit 12 uses the buffer memories 13-1 and 13-2, and there is no space. Until this occurs, the transfer control unit 14 cannot send a transfer command request for the third transfer data.

  In the present embodiment, the transfer control unit 14 can make a scheduled transfer command request (procedure S21) for the third transfer data in accordance with the empty display of the first buffer memory 13-1 by the procedure S9F. The subsequent procedure is the same as described above.

  Since such a configuration is adopted, even if some transfer data causes a delay in the end of data processing due to congestion on the network, retransmission of transfer data, collision of processing at the terminal device, etc., transmission to the next transfer data Transfer preparation including memory processing in the side apparatus can be advanced. That is, the efficiency of data transfer can be realized.

  In the above description, it is assumed that one data transfer command such as first and second is processed by one transfer command request. However, if there is room in the buffer memory on each of the transmission side and the reception side, a plurality of transfers are performed. A command group based on commands may be processed.

  Therefore, since the next data process can be performed alternately between the start of the transfer of certain data and the end of the process, in particular, the transmission side control unit performs twice the data transfer process as compared with the prior art. This makes it possible to improve efficiency.

  A second embodiment of the present invention will be described with reference to FIG.

  In the embodiment of FIG. 3, the two buffer memories are alternately used in the first embodiment, but a plurality of buffer memories are used to further improve the efficiency of data transfer.

  3 is different from FIG. 1 in that the N buffer memories 13-1 to 13-n provided in the peripheral control unit 12A of the host 10A and the M buffer memories 13-1 to 13 provided in the terminal device 30A. -M. Accordingly, the control information of the transfer control unit 14A, the prefetch information management unit 15A, the reception control unit 31A, and the prefetch information management unit 32A is slightly changed. However, these operation functions are exactly the same as those described in the above embodiment.

  This main sequence is the same as that shown in FIGS. 2A and 2B. As long as the buffer memory 13-1 to 13-n of the host 10A is free, the transfer command of the transmission side control unit 11A can be sent, and the transfer destination As long as there is a free space in the buffer memories 13-1 to 13-m of the terminal device 30A, it is easy to transfer and execute the processing.

  Therefore, the efficiency up to N times that of the prior art can be expected in consideration of the processing speed on the host side and the processing speed of the transfer destination device.

  For example, if the configuration is the same as that of the above embodiment, each of the buffer memories 13-1 to 13-n can be associated with one transfer command. However, since the transfer data amount handled by each transfer command is different in this embodiment, the buffer memory in the next order is determined by the start pointer position of the empty area of the buffer memory and the remaining memory amount. That is, there is one apparent free buffer memory.

  Next, the main operation of the transmission side control unit 11 in the host 10A will be described with reference to FIG. 3 and the flowchart of FIG.

  When the transfer data is generated (procedure S41 is YES) and the transfer command is received from the peripheral control unit 12A (procedure S42 is YES), the transmission side control unit 11 stores the transfer destination, the data amount, and the buffer memory 13 included in the command request. Information such as the head pointer is included in the transfer command and sent to the peripheral control unit 12A together with the transfer data (step S43). In response to this transmission, the peripheral control unit 12A sends a pseudo-response, and the transmission-side control unit 11 executes a predetermined process (procedure S45) with the pseudo-response being accepted as a regular response (YES in step S44). The procedure is returned to step S41.

  When the procedure S42 is “NO” and the transfer command request from the peripheral control unit 12A is waited, the transmission-side control unit 11 returns to the procedure S41 and holds the next generated transfer data as the next transfer command. Therefore, when the procedure S42 is “YES”, a plurality of “command + data” are sent out as a command group in the procedure S43.

  Next, the main operation of the peripheral control unit 12A in the host 10A will be described with reference to FIG. 3 and the flowchart of FIG.

  In the peripheral control unit 12A, the transfer control unit 14A inquires the reception status to the terminal device 30 when the predetermined time is reached (YES in step S51), and sends the response to the prefetch information management unit 15A to send the prefetch information memory 16 Is stored (step S52). At this time, if the buffer memory 13-x is in an empty state (YES in step S53), an empty head pointer, for example, the buffer memory 13-1 is designated, and a data transfer command request is sent to the transmission side control unit 11 (step S54). )I do.

  As a result, the transfer control unit 14A receives “command + data” from the transmission-side control unit 11, and stores it in the memory buffer 13-1 (step S55) and transfers it to the transfer destination terminal device 30A (step S56). ). If step S56 is “NO” and transfer is not possible, the transfer control unit 14A returns to step S56 as a transfer wait (step S57), and waits for “YES” to “transfer possible”.

  When step S56 is “YES” and “transfer is possible”, the transfer control unit 14A takes out the transfer data to be transferred from the buffer memory 13-1 and sends it to the terminal device 30A (step S61). Next, the transfer control unit 14A sends a pseudo response to the transfer data to the transmission side control unit 11 as a normal response (step S62).

  Thereafter, the transfer control unit 14A waits for a response of normal termination until acceptance from the transfer destination terminal device 30A (YES in step S63), erases the stored data in the corresponding buffer memory (for example) 13-1, and releases the empty space. Display (step S64).

  If there is data to be transferred to the transfer destination (YES in step S65) until the above step S63 is “NO” and a normal end response is received, the transfer control unit 14A returns to step S56.

  If step S65 is “NO” and there is no transfer waiting, this series of steps ends.

  The procedure S51 is periodic in the present embodiment, and the following procedure occurs even when the procedure after the procedure S56 is advanced. Therefore, the procedure after step S56 includes a data processing procedure waiting for transfer before the procedure at the predetermined time.

  Next, main operations in the terminal device 30A will be described with reference to FIG. 3 and the flowchart of FIG.

  First, when a reception status inquiry (YES in step S71) is received from the host 10A via the network 20, if the reception control unit 31A has no free buffer memory 33-x (NO in step S72), the host 10A Response "Prohibit transfer" is sent (step S73). When this procedure S72 is “YES” and “available”, the reception control unit 31A responds “transfer is possible” to the host 10A (procedure S74).

  Next, in the case of receiving transfer data together with a command (YES in step S75), the reception control unit 31A stores the received “command + data” in the buffer memory (for example) 33-1 designated by the command (step S76). To do. By storing the data, the terminal control unit 34 retrieves the “command + data” from the buffer memory 33-1 and executes the process (step S77).

  When the processing by the terminal control unit 34 is finished (step S78 is YES), the reception control unit 31A deletes the corresponding data in the buffer memory 33-1 (step S79), and sends a data-compliant end response to the transfer source. The data is sent to the host 10A (step S80).

  If the unprocessed data remains in the buffer memory (YES in step S81), the procedure returns to step S78, and is repeated until step S81 is “NO” and there is no unprocessed data.

  The procedure S71 is regular in this embodiment, and the procedure by the next data transfer occurs even when the procedure after the procedure S78 is advanced. Accordingly, the procedure after step S78 includes an unprocessed or in-process operation related to the transfer data before the procedure at the predetermined time.

  Since such a configuration is adopted, when the buffer memory is divided into small capacities, it is possible to store data more finely, so that the memory can be used effectively and the transfer efficiency can be improved.

  On the transmission side, when a plurality of transfer data is stored and transferred using a plurality of buffer memories, the next transfer process is started with the transfer data as a pseudo-response state, and the next transfer process is completed before the end of the previous data transfer process. Since the transfer process can be started, it is easy to sequentially store the transfer data in the buffer memory on the transmission side.

  Therefore, the present invention can be applied to applications where efficient data transfer processing of the transmission side control unit is necessary and indispensable. That is, it is a system that realizes communication via a network, and is effective for an apparatus that performs asynchronous communication. For example, this is effective for a display function that does not perform synchronous communication in which processing content is changed depending on response content from the terminal.

It is explanatory drawing which showed one Embodiment of the data transfer efficiency improvement system by this invention with the functional block. Example 1 It is explanatory drawing which showed the main operation | movement of FIG. 1 with the sequence chart. Example 1 It is explanatory drawing which showed a part of main operation | movement following FIG. 2A with the sequence chart. Example 1 It is explanatory drawing which showed one Embodiment of the data transfer efficiency improvement system by this invention with the functional block. (Example 2) It is explanatory drawing which showed the main operation | movement of the transmission side control part of FIG. 3 with the flowchart. (Example 2) It is explanatory drawing which showed the main operation | movement of the periphery control part of FIG. 3 with the flowchart. (Example 2) It is explanatory drawing which showed the main operation | movement of the terminal device of FIG. 3 with the flowchart. (Example 2) It is explanatory drawing which showed the example of the conventional data transfer efficiency system in the functional block. It is explanatory drawing which showed the main operation | movement of FIG. 7 with the sequence chart.

Explanation of symbols

10, 10A Host computer (host)
11 Transmission side control unit 12, 12A Peripheral control unit 13, 33 Buffer memory 14, 14A Transfer control unit 15, 15A Prefetch information management unit 16, 35 Prefetch information memory 20 Network 30, 30A Terminal device 31, 31A Reception control unit 32, 32A Prefetch Information Management Unit 34 Terminal Control Unit

Claims (11)

  In the method of transferring data from the transmission side to the reception side, the transmission side includes a plurality of buffer memories, and when data is transferred from the buffer memory to the reception side, a pseudo response is immediately generated and the next data transfer procedure is performed. A data transfer efficiency improving method characterized by proceeding.   2. The data transfer efficiency improvement method according to claim 1, wherein the next data transfer procedure stores the next transfer data in the empty area and transfers it to the receiving side when there is more free space in the remaining buffer memory. A data transfer efficiency improving method characterized by being a procedure.   2. The data transfer efficiency improvement method according to claim 1, wherein a pseudo response is recorded for the buffer memory to which data has been transferred on the transmission side, and when a normal end response is received from the reception side, A data transfer efficiency improvement method characterized by erasing data to make it empty.   2. The data transfer efficiency improvement method according to claim 1, wherein, on a transmission side, a transfer command generated up to this time is collectively processed as a transfer command group at a predetermined time including a regular time. Data transfer efficiency method.   2. The data transfer efficiency improvement method according to claim 1, wherein when transmitting data to the receiving side on the transmitting side, a status inquiry for data transfer is sent to the receiving side, and data transfer processing is performed based on the response. A method for improving data transfer efficiency.   2. The data transfer efficiency improvement method according to claim 1, wherein a plurality of buffer memories are provided on the reception side, and when a status inquiry for data transfer is received from the transmission side, the availability of the buffer memory is answered. The data transfer efficiency method, wherein the transmission side transfers data based on the availability.   In a system for transferring data from a transmission side device to a reception side device, the transmission side device stores a plurality of buffer memories for storing transfer data, and stores the transfer data when the buffer memory is free and transfers the data. A transmission side control unit that issues a command, and transfers data from the buffer memory in response to a command from the transmission side control unit, and at the time of the transfer, a pseudo response is immediately generated and the pseudo response is controlled by the transmission side control. A transfer control unit that notifies the transmission unit, the transmission side control unit stores the next transfer data in the empty buffer memory when the buffer memory is empty when receiving the pseudo response. A data transfer efficiency system characterized by instructing data transfer.   8. The data transfer efficiency system according to claim 7, wherein a pseudo response generated by the transfer control unit is received, stored in association with a target buffer memory, and a normal end response corresponding to the pseudo response from the transfer control unit. A data transfer efficiency system, further comprising a prefetch information management unit that deletes the target data and displays the buffer memory as empty when the data is received.   8. The data transfer efficiency system according to claim 7, wherein the receiving side has a plurality of receiving side buffer memories, and when receiving a status inquiry for data transfer from the transmitting side, the receiving side buffer memory is free. A data transfer efficiency system, comprising: a receiving side device for answering a situation, wherein, on the transmitting side, the transfer control unit transfers data based on a free state received from the receiving side device.   10. The data transfer efficiency system according to claim 9, wherein the status inquiry is executed on the transmission side periodically or when transfer data is generated. A plurality of buffer memories for storing transfer data in a transmission side device for transferring data to the reception side, a transmission side control unit for storing the transfer data when there is a space in the buffer memory and instructing the transfer; A transfer control unit that receives the transfer instruction and transfers data from the buffer memory, and immediately generates a pseudo-response at the time of the transfer and notifies the transmission-side control unit of the pseudo-response. The side controller stores the next transfer data in the empty buffer memory and instructs the data transfer when the buffer memory is empty when receiving the pseudo response. apparatus.

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