How does a Direct Memory Access (DMA) engine help to improve system performance?

Question

Accepted Answer

A DMA engine saves the CPU from spending lots of its cycles copying data from memory to a device by telling the DMA engine where the data is and where its going and letting it access memory directly.

Answer

A DMA engine is a way for the OS to give trusted processes access to store their data directly to physical memory addresses without the need for expensive translations from virtual addresses.

Answer

A DMA engine is a thread created by each running process automatically on modern systems that buffers I/O requests until the CPU is under-utilized and then directly copies the data from memory to the device.

Answer

A DMA engine is a special bus (connection) that connects a disk directly to memory, making data transfers faster.

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How does a Direct Memory Access (DMA) engine help to improve system performance?

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