lec21 - LECTURE - 21 Topics for Today Hit-time reduction...

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Unformatted text preview: LECTURE - 21 Topics for Today Hit-time reduction techniques Virtual memory Scribe for today? Small and Simple Caches Keep the cache small Faster Can fit inside processor Trade-off: tags within processor, data outside Keep the cache simple Direct-mapped ==> tag comparison can be in parallel with data transmission Other Techniques Faster writes: pipeline writes Split the tag and data storage in cache Pipeline stage-1: tag access and comparison Pipeline stage-2: write data Dealing with virtual address --> physical address translation Avoid it (virtually addressed caches) In parallel with cache access (virtually indexed, physically tagged cache) Virtual Memory Another level in the hierarchy Uses of virtual memory: Level of indirection No program overlays required Easy relocation Sharing and protection Just like Memory-->Cache in Functionality... Cache line Cache miss Memory --> cache mapping Page or segment Page fault VA --> PA mapping (address translation) But Quite Different Quantitatively...But Quite Different Quantitatively....
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lec21 - LECTURE - 21 Topics for Today Hit-time reduction...

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