Podcast
Questions and Answers
What type of registers does a device typically have for CPU interactions?
What type of registers does a device typically have for CPU interactions?
- Command, data, and status registers (correct)
- Primary, secondary, and tertiary registers
- Control, management, and communication registers
- Input, output, and processing registers
Which component of a device acts as its CPU?
Which component of a device acts as its CPU?
- Control register
- Data register
- Microcontroller (correct)
- Bridging controller
What type of logic is responsible for converting analog signals in devices?
What type of logic is responsible for converting analog signals in devices?
- Chips for analog-to-digital conversion (correct)
- Control registers
- Control bus
- Central Processing Unit
Which interconnect is described as more technologically advanced than PCI-X and PCI?
Which interconnect is described as more technologically advanced than PCI-X and PCI?
What is a key property of block devices like disks?
What is a key property of block devices like disks?
Which type of devices work with a serial sequence of characters?
Which type of devices work with a serial sequence of characters?
What are device drivers responsible for?
What are device drivers responsible for?
What does a bridging controller handle in devices?
What does a bridging controller handle in devices?
Which logic component is responsible for device-specific CPU operations?
Which logic component is responsible for device-specific CPU operations?
What do network devices deliver?
What do network devices deliver?
What do user processes interact with at the level of the user process?
What do user processes interact with at the level of the user process?
What standardized API is exposed to user processes by operating systems in file systems?
What standardized API is exposed to user processes by operating systems in file systems?
What type of API does the POSIX API consist of?
What type of API does the POSIX API consist of?
What persistent data structure is maintained for each file by the VFS?
What persistent data structure is maintained for each file by the VFS?
What represents the elements on which the Virtual File System (VFS) operates?
What represents the elements on which the Virtual File System (VFS) operates?
To help with operations on directories, what data structure does Linux maintain?
To help with operations on directories, what data structure does Linux maintain?
What do user applications interact with when accessing the Virtual File System (VFS)?
What do user applications interact with when accessing the Virtual File System (VFS)?
In the file system stack, what layer provides a standard for operating systems to interact with all types of block devices?
In the file system stack, what layer provides a standard for operating systems to interact with all types of block devices?
What operation can be performed on files using a file descriptor?
What operation can be performed on files using a file descriptor?
What allows the block device stack to mask differences among different block devices?
What allows the block device stack to mask differences among different block devices?
How many CPU accesses are needed to transmit a 1500B packet using 8 byte data registers?
How many CPU accesses are needed to transmit a 1500B packet using 8 byte data registers?
What additional hardware support is required for Direct Memory Access (DMA) in devices?
What additional hardware support is required for Direct Memory Access (DMA) in devices?
Why does the memory buffer involved in DMA need to be in physical memory until the transfer completes?
Why does the memory buffer involved in DMA need to be in physical memory until the transfer completes?
What is the responsibility of device drivers in the context of device operations?
What is the responsibility of device drivers in the context of device operations?
What is a driver responsible for in device configurations?
What is a driver responsible for in device configurations?
What is the reverse path of results/events originating on a device?
What is the reverse path of results/events originating on a device?
What does OS bypass in device operations allow in user processes?
What does OS bypass in device operations allow in user processes?
What is the primary role of the operating system in OS bypass configurations?
What is the primary role of the operating system in OS bypass configurations?
How does PIO compare to DMA in terms of efficiency for smaller transfers?
How does PIO compare to DMA in terms of efficiency for smaller transfers?
What action is required when a user process needs to interact with a hardware device?
What action is required when a user process needs to interact with a hardware device?
What is the role of indirect pointers in managing file content?
What is the role of indirect pointers in managing file content?
How does a double indirect pointer differ from a single indirect pointer?
How does a double indirect pointer differ from a single indirect pointer?
What is a downside of using indirect pointers in file systems?
What is a downside of using indirect pointers in file systems?
How do filesystems use buffer caches to enhance file access?
How do filesystems use buffer caches to enhance file access?
Which of the following best describes the purpose of I/O scheduling?
Which of the following best describes the purpose of I/O scheduling?
How does prefetching contribute to reducing file access latency?
How does prefetching contribute to reducing file access latency?
What purpose does journaling serve in file systems?
What purpose does journaling serve in file systems?
How does a single indirect pointer expand the addressable file content?
How does a single indirect pointer expand the addressable file content?
Why do I/O schedulers aim to reduce disk head movement?
Why do I/O schedulers aim to reduce disk head movement?
What is one advantage of using buffer caches in file systems?
What is one advantage of using buffer caches in file systems?
What is the main focus of I/O management in both toy shop and operating systems?
What is the main focus of I/O management in both toy shop and operating systems?
What is the role of dedicated handlers or staff in both toy shop and operating systems?
What is the role of dedicated handlers or staff in both toy shop and operating systems?
What is the purpose of device drivers and interrupt handlers in an operating system?
What is the purpose of device drivers and interrupt handlers in an operating system?
What is the role of I/O devices in a system?
What is the role of I/O devices in a system?
What is the challenge in managing I/O devices in a system?
What is the challenge in managing I/O devices in a system?
What is the importance of abstracting I/O details from the core processing or application execution?
What is the importance of abstracting I/O details from the core processing or application execution?
What is the primary role of the OS in making device registers available to the user process?
What is the primary role of the OS in making device registers available to the user process?
Why do we need a user-level driver to interact with the device?
Why do we need a user-level driver to interact with the device?
What is the purpose of the OS retaining some coarse-grain control?
What is the purpose of the OS retaining some coarse-grain control?
What happens when a network device receives a packet and needs to determine its target process?
What happens when a network device receives a packet and needs to determine its target process?
What does the device need to perform on received data to deliver it to the correct process?
What does the device need to perform on received data to deliver it to the correct process?
What happens to a user thread when making a synchronous I/O request?
What happens to a user thread when making a synchronous I/O request?
What is the benefit of asynchronous I/O operations?
What is the benefit of asynchronous I/O operations?
What is the purpose of the AMPED in the Flash paper?
What is the purpose of the AMPED in the Flash paper?
What is a file in the context of block devices?
What is a file in the context of block devices?
What is the purpose of the dentry cache in a filesystem?
What is the purpose of the dentry cache in a filesystem?
What is the role of the superblock in a filesystem?
What is the role of the superblock in a filesystem?
Which filesystem was the default filesystem in Linux until it was replaced by ext3 and ext4?
Which filesystem was the default filesystem in Linux until it was replaced by ext3 and ext4?
What is the purpose of a superblock in a block group?
What is the purpose of a superblock in a block group?
What is the purpose of inodes in a filesystem?
What is the purpose of inodes in a filesystem?
What is the benefit of using inodes to index files in a filesystem?
What is the benefit of using inodes to index files in a filesystem?
What is the downside of using inodes to index files in a filesystem?
What is the downside of using inodes to index files in a filesystem?
How is the limitation on file size addressed when using inodes to index files in a filesystem?
How is the limitation on file size addressed when using inodes to index files in a filesystem?
What is the purpose of dentries in a filesystem?
What is the purpose of dentries in a filesystem?
What is the purpose of bitmaps in ext2 filesystem?
What is the purpose of bitmaps in ext2 filesystem?
What is the main way in which PCI interconnects devices to the CPUs?
What is the main way in which PCI interconnects devices to the CPUs?
Which of the following is not a disadvantage of interrupts for device access?
Which of the following is not a disadvantage of interrupts for device access?
What is the purpose of the Base Address Registers (BAR) in device interactions?
What is the purpose of the Base Address Registers (BAR) in device interactions?
What type of device interface allows a CPU to transmit a network packet via a network interface card (NIC)?
What type of device interface allows a CPU to transmit a network packet via a network interface card (NIC)?
Which of the following is the correct sequence of steps when a CPU writes to device registers in memory-mapped I/O?
Which of the following is the correct sequence of steps when a CPU writes to device registers in memory-mapped I/O?
How does a process running on the CPU transmit a network packet via a network interface card (NIC) using Programmed I/O (PIO)?
How does a process running on the CPU transmit a network packet via a network interface card (NIC) using Programmed I/O (PIO)?
Which device access model does the I/O Port Model belong to?
Which device access model does the I/O Port Model belong to?
Which statement is true about polling devices for device access in CPUs?
Which statement is true about polling devices for device access in CPUs?
Which of the following is the correct order of steps for a CPU to request an operation from an I/O device using Programmed I/O (PIO)?
Which of the following is the correct order of steps for a CPU to request an operation from an I/O device using Programmed I/O (PIO)?
Which of the following statements is true about Interrupts for device access in CPUs?
Which of the following statements is true about Interrupts for device access in CPUs?
