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What is Interrupt Latency?

interrupt latency
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What is Interrupt Latency?

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Interrupt latency refers to the amount of time between when an interrupt is triggered and when the interrupt is seen by software. This can be caused by many factors. Some of these include: other drivers keeping interrupts disabled for a long period blocking in the interrupt service thread scheduling latency (waiting for the interrupt service thread to be scheduled) interrupt service thread priority (particularly for non-kernel drivers) If you are writing device drivers, it is your responsibility to avoid causing too much latency for other devices in the system. In extreme cases, it is possible to actually cause interrupts to be dropped by leaving interrupts turned off for too long. This can cause system instability, and in some machines, can actually cause the computer to spontaneously power down by causing a PMU synchronization failure. The best way to avoid such problems is to use interrupt service threads. This is the preferred way to service interrupts. However, if your driver is w

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