Interview Question


Country: United States




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Whenever device driver raise interrupt, the isr should process fast and respond to interrupt immediately, after creating data structure for device that called top halves and later it process other works related to device in bottom halves.

- AjayGautam February 19, 2015 | Flag Reply
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In networking perspective, top half can be treated as action that responds to packet reception that needs to be done immediately and bottom half would be performed later which includes packet processing and action according to the packet.

- nilesh.shinde54 February 22, 2015 | Flag Reply
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lengthy tasks inside interrupt handlers degrades system responsiveness
Top half(Interrupt handler) - perform time critical tasks such as acknowledging receipt of interrupt, resetting hardware etc
bottom half(deferred work) - perform any interrupt related work not performed by the interrupt handler

- Anonymous April 14, 2015 | Flag Reply
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Good explaination, In windows world, top half translates into ISR, interrupt service routine and bottom half translates into DPC, deferred procedure call, the routine working at lower priority dispatch level of CPU ?

- Chirag May 21, 2017 | Flag


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