What are the soft interrupts under Linux?

Soft interrupts under Linux are a mechanism used to process some high-priority tasks. Common soft interrupts are: 1. TASKLET_SOFTIRQ, used to process lightweight tasks; 2. HI_SOFTIRQ, used to Process high-priority tasks; 3. TIMER_SOFTIRQ, used to handle timer interrupts; 4. NET_TX_SOFTIRQ and NET_RX_SOFTIRQ, used to send and receive network data packets respectively; 5. BLOCK_SOFTIRQ, used for block device I/O.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

In the Linux kernel, softirq (Softirq) is a mechanism used to handle some high-priority tasks, such as network packet processing, timer processing and delayed work queue execution.

Soft interrupts are implemented in Linux through softirq handlers. The following are some common Linux soft interrupts:

1. TASKLET_SOFTIRQ: used to handle lightweight tasks, implemented through the tasklet mechanism.

2. HI_SOFTIRQ: Used to handle high-priority tasks, such as the reception and processing of network data packets.

3. TIMER_SOFTIRQ: Used to handle timer interrupts, such as periodic system timers.

4. NET_TX_SOFTIRQ and NET_RX_SOFTIRQ: used to send and receive network packets respectively.

5. BLOCK_SOFTIRQ: used for I/O operations on block devices.

   These soft interrupts will be triggered and processed during kernel operation to ensure that high-priority tasks can be executed in time. Each soft interrupt has a corresponding soft interrupt handler. The handler will be executed at the appropriate time and perform corresponding processing operations according to specific task requirements.
   

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