What strategies would you employ to lower interrupt latency?

Question

Anonymous · Accepted Answer

Interrupt latency is one of the key things needs attention for a deterministic
real time systems. The responsiveness of this system is affected when using
hardware devices.

Interrupt latency is the delay between an interrupt signal from a device and the
processor's response.

To reduce the latency:

* Keep the ISRs short and efficient; move complex tasks to background threads.

* Set appropriate interrupt priorities by assigning higher priority levels to
   urgent tasks.

* Avoiding using semaphores or mutexes within ISRs to prevent delays.

* Implementing interrupt safe data structures to reduce conflicts during
   interrupt handling.

* Keep device drivers up to date.

* Using system monitoring tools to monitor the interrupt resources.

* Optimize compiler and firmware for better ISR performance.

* Minimize background processes to free CPU resources.

Anonymous · Answer

Yes. Interrupt handles should be kept as fast as possible. Do the minimal amount
of work inside the interrupt handles and signal to a task to do the rest of
work, for example when data becomes available. Offliad work to DMAs. Make sure
intereupts are not disabled for longer times.

Anonymous · Answer

You can have multiple banks of register set, so no need to do context
switching(memory load of registers), just switch banks

What strategies would you employ to lower interrupt latency?

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