CN118101480A - Adaptive Interrupt Aggregation Device - Google Patents

Abstract

The present invention discloses an adaptive interrupt aggregation device, comprising: a bandwidth detection module, used to detect the average bandwidth of a data frame used to generate an interrupt request; an interrupt aggregation parameter configuration module, used to receive the average bandwidth sent by the bandwidth detection module, and obtain an interrupt aggregation threshold based on the average bandwidth and the acceptable bandwidth range of the processor; an interrupt aggregation judgment module, used to receive an interrupt request, and judge whether to aggregate the interrupt request based on the interrupt aggregation threshold sent by the interrupt aggregation parameter configuration module. The adaptive interrupt aggregation device of the present invention can independently make accurate and reasonable settings for the interrupt aggregation threshold based on the real-time detected bandwidth and the processing power of the processor, so that the entire interrupt aggregation mechanism has the ability to dynamically adjust the interrupt aggregation threshold according to the change of the previous data bandwidth.

Description

Adaptive Interrupt Aggregation Device

Technical Field

The invention relates to an adaptive interrupt aggregation device.

Background technique

As a mechanism for hardware-software interaction, interrupts are often used in data transmission scenarios. Specifically, data is received by hardware. When a certain amount of data is reached, the hardware will notify the software to take the data by submitting an interrupt. The frequency of hardware submitting interrupt requests is linked to the bandwidth of the data it receives. When the data bandwidth is high, there are more interrupt requests, and when the data bandwidth is low, there are fewer interrupt requests. Frequent interrupt requests will reduce the performance of the processor. Generally, interrupt aggregation is required to reduce the number of interrupts generated per unit time.

Interrupt aggregation refers to the method of combining multiple consecutive interrupt events into one interrupt request, and then sending them to the back-end processor for processing. This method can effectively reduce the number of interrupt requests, reduce the processor load, and improve its processing efficiency. Common interrupt aggregation implementation methods generally use timers or counters. The former counts the transition edges of the system clock, while the latter counts the received interrupt requests. When the count value reaches the preset threshold, a corresponding interrupt will be generated, and the count value will be reset to zero and count will start again.

It can be seen that the threshold setting of interrupt aggregation is an important part of the entire interrupt aggregation mechanism. If the threshold of interrupt aggregation is set too high, that is, there are too many interrupt requests aggregated, the processor will receive interrupts too low frequently, which will lead to increased delays in processing tasks, which is unacceptable for some systems that emphasize high real-time performance and low latency. If the threshold of interrupt aggregation is set too low, that is, there are too few interrupt requests aggregated, it will not be able to effectively reduce the number of interrupt requests and reduce the processor load.

Normally, the interrupt aggregation threshold is fixed. For a system with stable data bandwidth and stable processor performance, setting a suitable interrupt aggregation threshold according to the actual situation can ensure the working efficiency of the entire system. However, when the data bandwidth fluctuates greatly or the program running on the processor is in dynamic change, the fixed interrupt aggregation threshold obviously cannot meet the system's requirements for working performance and efficiency.

Summary of the invention

The present invention provides an adaptive interrupt aggregation device to solve the above-mentioned technical problems, and specifically adopts the following technical solutions:

An adaptive interrupt aggregation device, characterized by comprising:

A bandwidth detection module, used for detecting an average bandwidth of a data frame used to generate an interrupt request;

An interrupt aggregation parameter configuration module, configured to receive the average bandwidth sent by the bandwidth detection module, and obtain an interrupt aggregation threshold based on the average bandwidth and an acceptable bandwidth range of the processor;

The interrupt aggregation judgment module is used to receive an interrupt request and judge whether to aggregate the interrupt request based on the interrupt aggregation threshold sent by the interrupt aggregation parameter configuration module.

Furthermore, each time the bandwidth detection module receives a complete data frame, it records the length of the data frame and the number of clock cycles consumed. When the total recorded data frame length reaches a preset data volume threshold, the average bandwidth of the current data stream is obtained based on the total data frame length and the total number of clock cycles, and the average bandwidth is sent to the interrupt aggregation parameter configuration module.

Furthermore, the data volume threshold is smaller than the data volume required to generate an interrupt request.

Furthermore, the interrupt aggregation parameter configuration module compares the average bandwidth with the acceptable bandwidth range of the processor. If the average bandwidth is less than or equal to the maximum value of the acceptable bandwidth range, the interrupt aggregation threshold is set to 1. If the average bandwidth is greater than the maximum value of the acceptable bandwidth range, the average bandwidth is divided by the minimum value and the maximum value of the acceptable bandwidth range respectively, and the maximum integer between the two calculation results is taken as the interrupt aggregation threshold. Finally, the interrupt aggregation threshold is sent to the interrupt aggregation judgment module.

Furthermore, the interrupt aggregation judgment module receives interrupt requests and counts them, and performs interrupt aggregation judgment based on the interrupt aggregation threshold. If the count value of the interrupt request is greater than or equal to the interrupt aggregation threshold, the interrupt request is submitted to the subsequent processor; if the count value of the interrupt request is less than the interrupt aggregation threshold, interrupt aggregation continues.

Furthermore, the interruption aggregation determination module performs interruption aggregation determination according to the latest interruption aggregation threshold received.

Furthermore, when the interrupt aggregation judgment module performs interrupt aggregation judgment based on the latest interrupt aggregation threshold received, if the interrupt aggregation based on the previous old interrupt aggregation threshold has just been completed, the threshold is directly updated; if the interrupt aggregation based on the previous old interrupt aggregation threshold has not been completed, the judgment is performed based on the new interrupt aggregation threshold.

Furthermore, when the interrupt aggregation judgment module performs interrupt aggregation judgment based on the latest interrupt aggregation threshold received, if the interrupt aggregation based on the previous old interrupt aggregation threshold has not been completed, the newly received interrupt aggregation threshold is temporarily stored, and when a new interrupt request is received, the count value of the current interrupt request is compared with the temporarily stored new interrupt aggregation threshold. If the new interrupt aggregation threshold is greater than the count value of the current interrupt request, the threshold is updated and interrupt aggregation continues. If the new interrupt aggregation threshold is less than or equal to the count value of the current interrupt request, the interrupt request is submitted to the post-processor, and then the threshold is updated and interrupt aggregation continues.

Furthermore, the adaptive interrupt aggregation device further comprises:

The timer judgment module is used to limit the maximum aggregation time of the interrupt aggregation judgment module.

Furthermore, the timer judgment module counts the interrupt aggregation time within an interrupt aggregation cycle. When the interrupt aggregation judgment module receives a previous-level interrupt and starts the interrupt aggregation cycle, the timer judgment module synchronously starts to count the interrupt aggregation time. If the interrupt aggregation judgment module has not sent an interrupt request when the interrupt aggregation time exceeds the preset maximum aggregation time, the interrupt request is forced to be sent directly.

The benefit of the present invention lies in that the adaptive interrupt aggregation device provided can independently make accurate and reasonable settings for the interrupt aggregation threshold based on the real-time detected bandwidth and the processing power of the processor, thereby enabling the entire interrupt aggregation mechanism to have the ability to dynamically adjust the interrupt aggregation threshold according to changes in the previous-stage data bandwidth.

The invention is also beneficial in that the provided adaptive interrupt aggregation device also uses a timer timeout mechanism in parallel to avoid the situation where the previous data transmission is interrupted and the interrupt aggregation is not completed and an interrupt cannot be generated.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

FIG1 is a schematic diagram of an adaptive interrupt aggregation device of the present invention;

FIG2 is a schematic diagram of data bandwidth detection and threshold setting of an adaptive interrupt aggregation device of the present invention;

FIG3 is a flow chart of data bandwidth detection and threshold setting of an adaptive interrupt aggregation device of the present invention;

FIG4 is a flow chart of interrupt aggregation of an adaptive interrupt aggregation device according to the present invention;

Detailed ways

The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

As shown in FIG. 1 , an adaptive interrupt aggregation device of the present application includes: a bandwidth detection module, an interrupt aggregation parameter configuration module, an interrupt aggregation judgment module and a timer judgment module.

The bandwidth detection module is used to detect the average bandwidth of the data frame used to generate the interrupt request. The interrupt aggregation parameter configuration module is used to receive the average bandwidth sent by the bandwidth detection module, and obtain the interrupt aggregation threshold value based on the average bandwidth and the acceptable bandwidth range provided by the processor. The interrupt aggregation judgment module is used to receive the interrupt request, and judge whether to aggregate the interrupt request based on the interrupt aggregation threshold value sent by the interrupt aggregation parameter configuration module. In the embodiment of the present application, the interrupt aggregation judgment module includes an interrupt cache module for caching the received interrupt request. (In order to facilitate the drawing of the relationship between the modules, the interrupt cache module is listed separately in the block diagram in FIG1.) The timer judgment module is used to limit the maximum aggregation time of the interrupt aggregation judgment module. As shown in FIG2, after the data frame enters the bandwidth detection link for bandwidth detection, it will be sent to the subsequent stage for corresponding data processing, and finally generate an interrupt request for subsequent interrupt aggregation. When the amount of data for bandwidth detection reaches the required data amount threshold, the current data bandwidth will be calculated, and the threshold of interrupt aggregation will be calculated together with the acceptable bandwidth range provided by the processor.

The adaptive interrupt aggregation device of the present application is described in detail below in conjunction with the flowcharts of FIG. 3 and FIG. 4 .

In an embodiment of the present application, the bandwidth detection module starts and begins counting clock cycles when receiving the first data frame for generating an interrupt request, and then performs bandwidth detection. Each time a complete data frame is received, the amount of data recorded by the bandwidth detection will increase the corresponding data frame length. The length of the data frame and the number of clock cycles consumed are recorded. When the total recorded data frame length reaches the preset data volume threshold, the counting of the clock cycles will stop, thereby obtaining the total number of clock cycles consumed by the current data volume to be transmitted. The average bandwidth of the current data stream is obtained based on the ratio of the total data frame length and the total number of clock cycles, and the average bandwidth is sent to the interrupt aggregation parameter configuration module.

After the initialization configuration is completed, the data volume threshold required for bandwidth detection must be set reasonably, that is, the data volume threshold required for bandwidth detection must be less than the data volume required to generate an interrupt request, thereby ensuring that the initial setting of the threshold will be before the first interrupt request from the previous level arrives. This data volume threshold can be a certain data volume, such as 4MB. It can also be an integer multiple of the length of the received data frame. For example, if the size of the data frame is 64KB and the ratio value is 1/64, the threshold is 4MB.

In the implementation mode of the present application, the interrupt aggregation parameter configuration module compares the average bandwidth with the acceptable bandwidth range of the processor. If the average bandwidth is less than or equal to the maximum value of the acceptable bandwidth range, the interrupt aggregation threshold is set to 1, that is, the aggregation operation is not performed by default. If the average bandwidth is greater than the maximum value of the acceptable bandwidth range, the average bandwidth is divided by the minimum and maximum values of the acceptable bandwidth range respectively, and the maximum integer between the two calculation results is taken as the interrupt aggregation threshold, and finally the interrupt aggregation threshold is sent to the interrupt aggregation judgment module. After completing the above operations, the count value of the data volume and the number of clock cycles used for counting will be cleared, and the next round of bandwidth detection will be started.

In the implementation of the present application, the interrupt aggregation judgment module receives interrupt requests and counts them, and performs interrupt aggregation judgment according to the interrupt aggregation threshold. If the count value of the interrupt request is greater than or equal to the interrupt aggregation threshold, the interrupt request is submitted to the subsequent processor. If the count value of the interrupt request is less than the interrupt aggregation threshold, interrupt aggregation continues. After submitting the interrupt request, the count value is cleared and the counting starts again.

In an implementation manner of the present application, the interruption aggregation determination module performs interruption aggregation determination according to the latest interruption aggregation threshold received, further ensuring that the threshold update frequency does not lag behind the data bandwidth change.

In an embodiment of the present application, when the interrupt aggregation judgment module performs interrupt aggregation judgment according to the latest interrupt aggregation threshold value received, if the interrupt aggregation based on the previous old interrupt aggregation threshold value has just been completed, the threshold value is directly updated. If the interrupt aggregation based on the previous old interrupt aggregation threshold value has not been completed, the judgment is made according to the new interrupt aggregation threshold value. Specifically, when the interrupt aggregation judgment module performs interrupt aggregation judgment according to the latest interrupt aggregation threshold value received, if the interrupt aggregation based on the previous old interrupt aggregation threshold value has not been completed, the newly received interrupt aggregation threshold value is temporarily stored. When a new interrupt request sent from the previous level is received, the count value of the current interrupt request is compared with the temporarily stored new interrupt aggregation threshold value. If the new interrupt aggregation threshold value is greater than the count value of the current interrupt request, the threshold value is updated and interrupt aggregation is continued. If the new interrupt aggregation threshold value is less than or equal to the count value of the current interrupt request, the interrupt request is submitted to the subsequent processor, and then the threshold value is updated and interrupt aggregation is continued.

In the implementation of the present application, the timer judgment module counts the interrupt aggregation time within an interrupt aggregation cycle. The so-called interrupt aggregation cycle is the time for the interrupt aggregation judgment module to execute an interrupt. When the interrupt aggregation judgment module receives the previous interrupt and starts the interrupt aggregation cycle, the timer judgment module starts to count the interrupt aggregation time synchronously. If the interrupt aggregation judgment module has not sent an interrupt request when the interrupt aggregation time exceeds the preset maximum aggregation time, the interrupt request is forced to be sent directly. Specifically, after the initialization configuration is completed, the timer is in a ready state, and the set maximum aggregation time is generally much longer than the time required for interrupt aggregation. When the interrupt aggregation judgment module receives the first interrupt request sent by the previous level, the timer will start. Before the timer times out, if the interrupt aggregation is completed and the interrupt request is submitted to the next level, the timer is cleared and the timing is restarted; if the interrupt aggregation is not completed, the interrupt request is forced to be generated and submitted, and then the timer is cleared, and the timing is restarted when the device receives the interrupt request from the previous level again, and so on. The timing mechanism exists to ensure that when the interrupt aggregation cannot be completed due to sudden phenomena such as data transmission stopping and interruption generating abnormalities, the device can still submit an interrupt request to the next level.

The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims (10)

1. An adaptive interrupt coalescing apparatus, comprising:

A bandwidth detection module for detecting an average bandwidth of data frames used for generating an interrupt request;

The interrupt aggregation parameter configuration module is used for receiving the average bandwidth sent by the bandwidth detection module and obtaining an interrupt aggregation threshold value based on the average bandwidth and the acceptable bandwidth range of the processor;

And the interrupt aggregation judging module is used for receiving the interrupt request and judging whether to aggregate the interrupt request based on the interrupt aggregation threshold value sent by the interrupt aggregation parameter configuration module.

2. The adaptive interrupt coalescing device of claim 1 wherein,

And when the length of the recorded total data frame reaches a preset data quantity threshold value, obtaining the average bandwidth of the current data stream according to the total data frame length and the total clock cycle number, and transmitting the average bandwidth to the interrupt aggregation parameter configuration module.

3. The adaptive interrupt coalescing device of claim 2 wherein,

The data amount threshold is smaller than the amount of data required to generate an interrupt request.

4. The adaptive interrupt coalescing device of claim 1 wherein,

The interrupt aggregation parameter configuration module compares the average bandwidth with an acceptable bandwidth range of a processor, if the average bandwidth is smaller than or equal to the maximum value of the acceptable bandwidth range, the interrupt aggregation threshold is set to be 1, if the average bandwidth is larger than the maximum value of the acceptable bandwidth range, the average bandwidth is divided by the minimum value and the maximum value of the acceptable bandwidth range respectively, the maximum integer is taken as the interrupt aggregation threshold between the two calculation results, and finally the interrupt aggregation threshold is sent to the interrupt aggregation judgment module.

5. The adaptive interrupt coalescing device of claim 1 wherein,

The interrupt aggregation judging module receives and counts the interrupt requests, carries out interrupt aggregation judgment according to the interrupt aggregation threshold, submits the interrupt requests to a later processor if the count value of the interrupt requests is greater than or equal to the interrupt aggregation threshold, and continues to carry out interrupt aggregation if the count value of the interrupt requests is less than the interrupt aggregation threshold.

6. The adaptive interrupt coalescing device of claim 5 wherein,

And the interrupt aggregation judgment module judges interrupt aggregation according to the received latest interrupt aggregation threshold.

7. The adaptive interrupt coalescing device of claim 6 wherein,

When the interrupt aggregation judgment module judges interrupt aggregation according to the received latest interrupt aggregation threshold, if interrupt aggregation based on the last old interrupt aggregation threshold is just completed, the threshold is directly updated, and if interrupt aggregation based on the last old interrupt aggregation threshold is not completed, judgment is carried out according to the new interrupt aggregation threshold.

8. The adaptive interrupt coalescing device of claim 7 wherein,

And when the interrupt aggregation judgment module judges the interrupt aggregation according to the received latest interrupt aggregation threshold, if the interrupt aggregation based on the last old interrupt aggregation threshold is not completed yet, temporarily storing the newly received interrupt aggregation threshold, when a new interrupt request is received, comparing the count value of the current interrupt request with the temporarily stored new interrupt aggregation threshold, if the new interrupt aggregation threshold is larger than the count value of the current interrupt request, updating the threshold and continuing to perform interrupt aggregation, and if the new interrupt aggregation threshold is smaller than or equal to the count value of the current interrupt request, submitting the interrupt request to a rear-stage processor, and then updating the threshold and continuing to perform interrupt aggregation.

9. The adaptive interrupt coalescing device of claim 1 wherein,

The adaptive interrupt aggregation device further includes:

And the timer judging module is used for limiting the maximum aggregation time of the interrupt aggregation judging module.

10. The adaptive interrupt coalescing device of claim 9 wherein,

The timer judging module counts the interrupt aggregation time in an interrupt aggregation period, when the interrupt aggregation judging module receives a previous interrupt and starts the interrupt aggregation period, the timer judging module synchronously starts counting the interrupt aggregation time, and if the interrupt aggregation judging module does not send an interrupt request when the interrupt aggregation time exceeds the preset maximum aggregation time, the interrupt request is forced to be directly sent.