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Q 1. Suppose we have a 1.5-GHz CPU to which the following three I/O devices are connected:


  1. Flash drive that can transfer data in 32-byte chunks with a maximum transfer rate of 16 MB/sec
  2. DVD drive which can transfer data in 16-byte chunks with a maximum transfer rate of 16 MB/sec
  3. Joystick that needs to be polled 50 times per second


Polling requires 300 instructions for each I/O device. Students are required to compute the percentage of CPU time required to poll each device.



Q 2. Instead of polling, we want to use interrupts for handling the DVD drive. Keeping in view the DVD drive to be active only 12% of the time, you are required to compute the percentage of CPU time for handling it.


Note: Interrupt and polling requires the same amount of instructions.

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Replies to This Discussion

kuu chan: Link send krna .. jahan ap ne ye example dekhi....

plz share the complete sollution 

wrong nahi hai yeh yaar, ku k CPU k speed 500 MHz nahi 1500 MHz hai

Boht dificlt hai mada banda fail ho jaega

muhammad Arslan bhai ye 2nd question ka jawab 

First k first part ka, Check it for errors 

Ksi ny second part bhi solve kia he ya nhi?


check it khen s mili h

Nhi ye thk nhi he, is me 500 ki jaga 1500 ho to thk ho jay gi



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