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Computer Memory Hierarchy Design, High Tech, Page 12

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See entire paper: http://electronics.wesrch.com/pdfEL11TZ5IXWACU
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Page content:

7. Reduce Miss Penalty:
Early Restart and Critical Word First
• Don't wait for full block before restarting CPU
• Early restart-As soon as the requested word of the block
arrives, send it to the CPU and let the CPU continue execution
- Spatial locality ⇒ tend to want next sequential word, so not clear size
of benefit of just early restart
• Critical Word First-Request the missed word first from memory
and send it to the CPU as soon as it arrives; let the CPU continue
execution while filling the rest of the words in the block
- Long blocks more popular today ⇒ Critical Word 1st Widely used

block

CA Lecture10 - memory hierarchy design (cwliu@twins.ee.nctu.edu.tw) 10-12

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