While it is true that DMA's purpose is for high-speed I/O devices to avoid CPU's execution load, CPU is allowed to execute other programs while the DMA controller is transferring the data. If this process causes interference with user program execution, then what kind of interference does it cause?
ChatGPT suggests the following: DMA and CPU compete for access to memory and other system resources.
When DMA operations complete or encounter errors, they may trigger interrupts that require CPU attention.
DMA operations consume memory bandwidth, which may reduce the available bandwidth for user programs. This can slow down memory-intensive tasks or lead to increased latency in accessing memory for both DMA and CPU operations.
In some cases, user programs may need to synchronize with DMA operations to ensure data integrity or coordinate processing tasks. This synchronization overhead can introduce delays or complexity into program execution.
Can you please tell me how accurate these are or elaborate on them?