In a polling-based network receives, the operating system keeps checking the status register after a fixed time interval to see whether a device needs hardware attention or not. CPU gradually checks the status of receive bit after a defined time interval of a clock and if the value of receive bit is true then data is moved from the RX register to the memory. In interrupt-based networks, whenever a device needs hardware processing then an interrupt is raised to inform the CPU for device attention. The data of the device is transferred to memory from the network card.
Polling is a protocol, not a hardware mechanism where the device gets attention by CPU. An interrupt is a hardware mechanism, not a protocol where the device gets attention by the interrupt handler. In polling, during receiving, parts of received data need to transfer to memory but in case of interrupts, whole data is transferred at once after receiving is done. An interrupt is a heavy operation as compared to pooling because hardware involves in it. For large amounts of data, Polling becomes an inefficient method. In polling, CPU gradually checks devices at regular intervals whereas the Interrupt handler can send interrupt at any time. Each device has its own Command ready bit which indicates whether the device requires servicing or not. In polling, CPU wastes numerous clock cycles by repetitively checking the command-ready little bit of each device. In Interrupt based network, the interrupt request line indicates whether the device requires servicing or not. In interrupt-based network, CPU cycles not wasted but CPU is disturbed only when device send interrupt signals.
Relative performance between programmed I/O and DMA:
For determining the relative performance between programmed I/O and DMA, important factors are:
1. Size of data
2. Frequency of operations
Answer:
Traditional business plan format
Executive summary. Briefly tell your reader what your company is and why it will be successful. ...
Company description. ...
Market analysis. ...
Organization and management. ...
Service or product line. ...
Marketing and sales. ...
Funding request. ...
Financial projections.
Explanation:
Hope it helps
Answer:
Technician B is right.
Explanation:
Generally speaking, most engines use a mixture of 50/50 coolant and water.
This is ideal in places where the weather never gets too extreme, and temperatures rarely go below 0 degrees. Using 100% antifreeze or coolant in any engine is not recommended since this doesn't have the same ability as water to transfer heat to or from the engine. Antifreeze is used to lower the freezing point of water, and it is water itself that does the job of keeping engine temperatures safe.
Answer:Attributes, Methods
Explanation: According to the object-oriented programming, attribute serves as the purpose for defining the an elements features and functioning.It is usually in the form of collection of objects and also known as object's member variable.
Method in the OOP's concept is defined as technique that works on the object that consist of some data and certain features.It also clarifies about the usage or utilization of that data message according to their behavior.
