Quote: about 40% of I/O time in UNIX is copying between system and user buffers

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The performance of the new file system is … the system's address space to data buffers in … performing an I/O operation. If the buffers in … VAX virtual memory management hardware. … We did not implement this because it would … required to allocate buffers on page boundaries, and …   Google-1   Google-2

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Quote: UNIX does not remap user buffers for I/O since requires page alignment and data would disappear after a write

Related Topics

Topic: file input/output (21 items)
Topic: virtual memory (32 items)