w5 quiz

Is 48 Bytes a valid page size?

• Yes, 48 Bytes is a valid page size.
• No, 48 Bytes is not a valid page size

On a 32-bit machine, what is the maximum size of the virtual address space?

• 4GB

• 2GB

• 200MB

• 1TB

Who detects/handles a page fault?

• The MMU detects page faults (hardware), but the kernel is responsible for handling page faults (software)

• The MMU detects page faults (software), but the kernel is responsible for handling page faults (software)

• The MMU is responsible for handling page faults (hardware), but the kernel detects page faults (software)

DMA is used to

• reduce CPU load because of Programmed IO

• Increase the security of IO transfers with additional checks

The IOMMU is used to:

• Control CPU performance for applications.
• to ensure that devices only access memory that they’re supposed to access

• Store data for virtual machines.

The cache

• needs to be invalidated before DMA transfer

• is never affected by a DMA transfer

A typical Unix page is

• 2048 bytes
• 1024 bytes
• 4096 bytes
• 8192 bytes

if Page has 4KB, having bits 6-11 set bits is smart because

• we can realize a fast VIPT solution

• VIVT solutions have less problems this way

• PIVT solutions become viable

• PIPT become even faster

Consider huge pages (2MB of contentious physical memory is mapped), this is

• faster because we dont need the Page Table (PL1)

• faster because we dont need the Page Map Table (PL4)

ASID solves ____ is VIVT caches

• synonyms

• homonyms

• both synonyms and homonyms