JPH05219119A - Data input regulating system - Google Patents

Abstract

PURPOSE:To exhibit the capacity of a data processor to the maximum by regulating the input of data in accordance with the load factor of the data processor or data retention time at a buffer. CONSTITUTION:A load factor measuring means 4 for a data processor 3 is provided, and when the measured load factor exceeds a prescribed value, the input of the data to an opposite system is regulated in a transmission control procedure processing means 1. Besides, a retention time monitoring timer 5 which is started at the time when the data is stored in a buffer 2 from the transmission control procedure processing means 1 and is reset at the time when this data is taken out to the data processor 3 is provided. Then, in the transmission control procedure processing means 1, the input of the data to the opposite system is regulated on the basis of the time-out of the retention time monitoring timer 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data input restriction method in a node device or the like of a communication system for packet transmission, and in particular, data input is restricted by the load factor of a processor or the data retention time of a buffer. It concerns the regulation system.

In a communication system for packet transmission, when the number of input data increases, a data buffer becomes full and data loss occurs, or a processor for data processing becomes overloaded. , It is necessary to regulate the data input from the partner system.

Such an input data control method is appropriately performed when the system capacity limit is reached without having to determine the optimum value of the number of data in the buffer for storing the input data. Requested.

[0004]

2. Description of the Related Art As a conventional data input regulation system in a communication system, a transmission control procedure processing unit regulates the number of data that can be stored in a buffer, and when the number of data becomes full, the other system There is a method of restricting the input.

The data input regulation in the communication system is
It is necessary to maximize the capacity of the processor that performs communication processing, and to make appropriate input restrictions when the capacity limit is reached. It is necessary to grasp the optimum value of the number of data in. The optimum value of the number of data is a variable determined by factors such as the capacity of the data processor, the number of lines, the line speed, and the frequency of data generation.

However, in an actual system, it is not easy to determine the optimum value of the number of data in the buffer. Therefore, conventionally, the following two methods have been used as data input restriction methods in communication systems.

FIG. 6 shows a first conventional data input regulation system, in which one buffer is used for all lines to manage the number of data in the buffer according to the MAX line specification. ing. In FIG. 6, 11 is a transmission control procedure processing unit, and 12 is a buffer 12. 13 is a data processing processor for performing communication processing, 21 is a watchdog timer (WDT) for preventing overload of the data processing processor 13, 22 is a line control adapter for connecting lines, 23 _1, 23 _2, ... _, 23 _n are lines # 1, #
2, ..., #n are drivers, and 24 is a communication control unit (CCU) that controls the line control adapter 22.

In FIG. 6, the buffer 12 has all lines #
1, # 2, ..., #n are provided only once, and when the number of data that can be stored becomes full, the input restriction is applied to all lines at once.

In the data input regulation system shown in FIG. 6,
In order to be able to process as much communication as possible, it is desirable to make the number of data that can be stored in the buffer 12 as large as possible. However, when the maximum (MAX) line specifications that can occur in system operation are set, the buffer area as a resource may be wasted.

In the system shown in FIG. 6, when the buffer is operated on the MAX line, if data is evenly input from each line and the data is accumulated on average, the buffer is designed. Optimal control of the street will be performed.

However, in actual operation, the MAX line capacity of the designed value is not always used, and in many cases, the number of lines is usually smaller than the number of MAX lines, but in such a case, However, a large waste will occur in the buffer area as a resource.

When a large amount of data is input from only a specific line, the buffer 12 is assumed to be a MAX line, so that the buffer capacity is large and the load factor of the data processor 13 is 100%. Even though it is in the state, since the buffer is not full, the input is not regulated and the data continues to be received.
Therefore, finally, the watchdog timer 21 that prevents the overload of the data processor operates to initialize the system (IPL). The watchdog timer 21 is normally the data processor 13
When the load factor of 100% continues for 10 minutes, IP
L is set.

On the other hand, one buffer 12 for all lines
When the number of data that can be stored is reduced by using, the load factor of the data processor 13 is low, for example, about 20%.
Since the buffer 12 becomes full, data input is restricted.

As described above, it is extremely difficult to determine the optimum value of the number of data in the buffer in order to maximize the capacity of the system.

[0015] Figure 7 is a shows a conventional second data input regulation scheme, the same meanings in the same numbers as in FIG. _{6, 12 1, 12 2,} ..., 12 n each line # 1, #
, ..., #n are provided in the buffer.

In the system shown in FIG. 7, the number of data buffers suitable for each line is determined in consideration of the line speed and the frequency of data generation for each line, and the buffer for each line is determined. Manage. For example, the buffer is made large for a line having a high line speed and a high data generation frequency, and the buffer is made small for a line having a low line speed and a low data generation frequency.

In the second data input regulation system shown in FIG. 7, the number of data in the buffer as a whole is not decided unlike the first system, and therefore, a buffer suitable for each buffer is considerably suitable. It is possible to determine the number of data items for each line, and it is also possible to regulate the data input for each line.

However, in the recent system, the line control is performed by the drivers 23 _1, 23 _2, ... _, 23 in FIG.
_This is often realized by firmware in the CCU 24 or CCU 24, and a common buffer pool is required for each level. From the viewpoint of the system as a whole, the optimum buffer value for these transmission control procedure processing units is required. Therefore, we must consider the optimum value of the overall buffer.

[0019]

Thus, although the determination of the optimum buffer value is an important factor in determining the performance of the system, the determination is extremely difficult. Therefore, in the conventional system, the data input regulation based on the number of data in the buffer is not always related to the processing load state in the data processing processor, and therefore, there is a problem that the capacity of the data processing processor cannot be maximized. there were.

The present invention is intended to solve the problems of the prior art, and determines the number of data in the buffer by restricting the data input according to the load factor of the data processor or the data retention time in the buffer. It is an object of the present invention to provide a data input regulation method that can maximize the capabilities of the data processor without the difficulty of the above.

[0021]

FIG. 1 shows the basic configuration of the present invention. The present invention includes a transmission control procedure processing means 1 for receiving a data by performing a predetermined transmission control procedure with a partner system connected via a communication line, and a buffer 2 for storing the received data for each line. In a communication system including a data processing processor 3 for taking out stored data and performing a predetermined process, a load factor measuring means 4 for measuring a load factor in the data processing processor 3 is provided, and the transmission control procedure processing means 1 is provided. In (1), when the measured load factor exceeds a predetermined value, the data input restriction to the partner system is performed, and when the load factor becomes equal to or less than another predetermined value, the data input restriction is released.

Further, according to the present invention, a transmission control procedure processing means 1 for receiving data by performing a predetermined transmission control procedure with a partner system connected via a communication line, and the received data for each line. In a communication system including a buffer 2 for storing data and a data processor 3 for taking out stored data and performing a predetermined process, when data is stored from the transmission control procedure processing means 1 into the buffer 2, it is activated for a fixed time. Is provided, and a staying time monitoring timer 5 that resets the data when it is taken out to the data processor 3 and a data number determination means 6 that determines that the number of data stored in the buffer 2 has become 0 are provided. In the transmission control procedure processing means 1, the data input to the partner system is regulated by the timeout of the residence time monitoring timer 5, and When the number of data in the data count determination unit 6 becomes 0 is determined, it is intended to release the data input controls on the remote system.

[0023]

In the node device of the packet communication system, basically, regardless of the contents of the packet or the data length,
Since the processing time per packet can be regarded as the same, the processing load state can be represented by the number of processed packets per unit time, and the processing performance can be represented by the maximum number of packets that can be processed.

The retention of packets in the buffer occurs when the processing load state of the data processor becomes 100% (that is, overload), and if the inflow of packets continues during that period, the number of retained packets in the buffer will change. Increase. On the contrary, the accumulated packets cannot be eliminated unless the load factor of the data processor decreases to some extent.
That is, the load factor of the data processing processor at a certain point governs the staying state of packets thereafter.

In the present invention, the load factor of the data processor is regarded as a leading indicator of packet retention in the buffer, and this is used for data input regulation.

FIG. 2 illustrates a data input regulation system by the data processor, and the same components as those in FIG. 1 are designated by the same numbers. That is, in the present invention, the buffer 2 having an appropriate size is used, and the load factor of the data processor 3 is a constant value n%.
When (n% is a value close to 100%) is exceeded, packet retention is predicted and data input is restricted to prevent it.

When the load factor of the data processor 3 falls below a fixed value m% (m <n), the data input restriction is released. In order to prevent repetition of valid input restriction ← → cancellation frequently, n and m are set to values that are apart from each other to some extent.

The load factor of the data processor 3 is
The detection is performed using the measurement function provided in the hardware or the operating system (OS) or the load factor measurement function by the application.

The data inflow regulation is realized by means such as a buffer-busy notification response of the transmission control procedure level or the network protocol, and no response return.

As another method, the data input can be restricted by the retention time of the received data in the buffer. In this case, the retention time of the data in the buffer is used instead of the load factor of the data processor described above, and when this exceeds a certain value T, the retention of the packet is predicted, and data is stored to prevent it. Input restriction. When the number of received data in the buffer becomes 0, the data input restriction is released.

Data retention time T in the buffer
Can be known by measuring the time from the buffer storage time to the extraction time for each received data using a timer that monitors the residence time.

[0032]

FIG. 3 shows an embodiment of the data input regulation system of the present invention, in which the same components as those in FIG. 6 are designated by the same reference numerals, and 14 is a load factor measuring unit.

In the data input regulation system of the present invention,
For example, when the load factor of the data processor that should perform the input restriction of data is 90% and the load factor of the data processor that should release the input restriction is 50% and normal data processing is performed, the data processor When the load factor of is more than 90%, the data input regulation shown in the above is performed, and further the data input regulation is performed, so that the load factor of the data processor is reduced to less than 50%. When it becomes, the data input restriction shown in the above is canceled.

As described above, in the method of the present invention, by setting the load factor of the data processor for setting or canceling the data input regulation in advance, when the load factor exceeds an arbitrary load factor, Enforce data entry restrictions.

In the embodiment shown in FIG. 3, since the data input is regulated according to the load factor of the data processor, the optimum value of the number of data in the buffer, which has been very difficult in the past, is strictly determined. Since it is not necessary and the input of data is regulated by the load factor of the data processor, the number of data in the buffer is
All you need to do is set a suitable size. Further, it is not necessary to consider the number of lines, the line speed, and the frequency of data generation, and at least the IPL of the system due to the watchdog timer operation based on the overload of the data processor will not occur. Further, since the input of data is regulated by the load factor of the data processor, it is possible to maximize the capacity of the data processor.

FIG. 4 shows another embodiment of the data input regulation system of the present invention, in which the same components as those in FIG. 3 are designated by the same numbers, and 15 measures the retention time of data in the buffer 12. A staying time monitoring timer is provided, and a data number determination unit 16 determines the number of data in the buffer 12.

FIG. 5 illustrates the data input regulation process in the embodiment shown in FIG. Now
Assuming that the retention time of data in the reception data buffer for which data input restriction is to be performed is T, the data input restriction process in this embodiment is performed as follows.

The transmission control procedure processing unit 11 receives the data 1 and stores the data 1 in the buffer 12 while the residence time monitoring timer 15 is stopped, and also activates the residence time monitoring timer 15. The data processor 13 takes out the data 1 from the buffer 12 and stops the residence time monitoring timer 15. During this period, the retention time is not measured when storing or retrieving other data.

When such processing is repeatedly performed and, for example, in the data 6, the residence time monitoring timer 15 times out, the transmission control procedure processing unit 11 notifies the communication partner system of the data input restriction. To do. When the data number determination unit 16 determines that the number of data items to be retrieved from the buffer 12 has become 0, the transmission control procedure processing unit 11 notifies the communication partner system of the data input restriction release.

In the embodiment shown in FIG. 4, since the congestion state of the system and the timing of data input regulation match,
It is possible to reliably determine that the received data cannot be processed, regulate the data input, and ensure a predetermined throughput. Further, by setting the monitoring time value of the residence time monitoring timer 15 to be somewhat shorter than the monitoring time value of the watchdog timer, it is possible to avoid the system from stopping due to the continuation of the high load state. In the case of the present embodiment, since it is not necessary to consider the hardware configuration of the system, the data generation frequency, etc., it is relatively easy to set the timer value for which the data input restriction is to be performed.

[0041]

As described above, according to the present invention, it is possible to reliably regulate the data input in the communication system, to easily set the data input regulation condition, and to overload the data processor. It is possible to prevent the operation of the watchdog timer based on the above to some extent, and it is possible to maximize the performance of the data processor.

[Brief description of drawings]

FIG. 1 is a diagram showing a principle configuration of the present invention.

FIG. 2 is a diagram illustrating a data input restriction system by a data processor.

FIG. 3 is a diagram showing an embodiment of a data input regulation system of the present invention.

FIG. 4 is a diagram showing another embodiment of the data input regulation system of the present invention.

5 is a diagram illustrating a data input restriction process in the embodiment illustrated in FIG.

FIG. 6 is a diagram showing a first conventional data input regulation system.

FIG. 7 is a diagram showing a second conventional data input regulation system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission control procedure processing means 2 Buffer 3 Data processor 4 Load factor measuring means 5 Residence time monitoring timer 6 Data number judging means

Claims (2)

[Claims] 1. A transmission control procedure processing means (1) for receiving data by performing a predetermined transmission control procedure with a partner system connected via a communication line, and the received data for each line. In a communication system including a buffer (2) for storing and a data processor (3) for taking out the stored data and performing a predetermined process, a load factor for measuring a load factor in the data processor (3) A measurement means (4) is provided, and when the measured load factor exceeds a predetermined value, the transmission control procedure processing means (1) restricts data input to the partner system, and the load factor has another predetermined value. A data input restriction method, wherein the data input restriction is released when the following occurs. 2. A transmission control procedure processing means (1) for receiving data by performing a predetermined transmission control procedure with a partner system connected via a communication line, and the received data for each line. In a communication system comprising a buffer (2) for storing and a data processor (3) for taking out the stored data and performing a predetermined process, the transmission control procedure processing means (1) to the buffer (2) And a data stored in the buffer (2), which is activated when the data is stored in the buffer, counts a certain time, and resets the data when the data is taken out to the data processor (3). A data number judging means (6) for judging that the number has become 0 is provided, and in the transmission control procedure processing means (1), the retention time monitoring timer (5) is timed out. Therefore, the data input is restricted to the partner system, and the data input restriction to the partner system is released when the data number judging means (6) judges that the number of data becomes 0. Regulation system.