GATE 2006
April 6, 2025GATE 2006-IT
April 6, 2025GATE 2006-IT
| Question 8 |
Which of the following DMA transfer modes and interrupt handling mechanisms will enable the highest I/O band-width?
| Transparent DMA and Polling interrupts | |
| Cycle-stealing and Vectored interrupts | |
| Block transfer and Vectored interrupts | |
| Block transfer and Polling interrupts |
Question 8 Explanation:
→ CPU has highest bandwidth in transparent DMA and polling. But it asked for I/O bandwidth not CPU bandwidth option. A is wrong.
→ In case of cycle stealing in each cycle time derive send data then wait again few CPU cycle it sends to memory. So, option B is wrong.
→ In case of polling CPU takes the initiative. So I/O bandwidth cannot be high. So, option D is wrong.
→ Consider block transfer in each single block device. Send data so bandwidth must be high. This makes option (C) correct.
→ In case of cycle stealing in each cycle time derive send data then wait again few CPU cycle it sends to memory. So, option B is wrong.
→ In case of polling CPU takes the initiative. So I/O bandwidth cannot be high. So, option D is wrong.
→ Consider block transfer in each single block device. Send data so bandwidth must be high. This makes option (C) correct.
Correct Answer: C
Question 8 Explanation:
→ CPU has highest bandwidth in transparent DMA and polling. But it asked for I/O bandwidth not CPU bandwidth option. A is wrong.
→ In case of cycle stealing in each cycle time derive send data then wait again few CPU cycle it sends to memory. So, option B is wrong.
→ In case of polling CPU takes the initiative. So I/O bandwidth cannot be high. So, option D is wrong.
→ Consider block transfer in each single block device. Send data so bandwidth must be high. This makes option (C) correct.
→ In case of cycle stealing in each cycle time derive send data then wait again few CPU cycle it sends to memory. So, option B is wrong.
→ In case of polling CPU takes the initiative. So I/O bandwidth cannot be high. So, option D is wrong.
→ Consider block transfer in each single block device. Send data so bandwidth must be high. This makes option (C) correct.