July 2004
Intermediate to advanced
1744 pages
35h 3m
English
Content preview from The Unabridged Pentium 4 IA32 Processor GenealogyBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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HT and the TLBs
Refer to “Eliminating the Directory Lookup” on page 234 for a description of the TLB.
Whether a processor's TLBs are shared by the logical processors in a physical processor or they are replicated for each logical processor is implementation-specific. As of this writing (03/09/04), the DTLB is shared and the ITLBs are replicated.
When a Page Table Entry (PTE) for a 4KB page, or a Page Directory Entry (PDE) for a large page (2MB or 4MB) is cached in the TLB, it is tagged with the logical processor ID of the logical processor that caused the table lookup. If a thread executing on a logical processor should load a new value into CR3, CR4, or should execute the INVLPG instruction, only the TLB entries that are tagged for that logical ...
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