It is an associative cache and consists of an instruction TLB and data TLB. Translation Lookaside Buffer (TLB) - this type of cache is used for storing virtual-to-physical memory translation information. Specifically, the processor has already broken down the normal processor instructions into micro operations and it is these "micro ops" that are cached by the P4 in the Trace Cache. Trace Cache - this type of cache is used only for caching decoded instructions. It is smaller than the Level 2 Cache and generally is used for the most frequently accessed information for the processor. Level 1 Cache - this type of cache is used only for caching data. It is normally smaller than the Level 3 cache (if present) and is used for caching both data and code that is being used by the processor. Level 2 Cache - this type of cache is available in all versions of the Pentium 4 Processor. Thus, the contents of the Level 3 cache are faster to access than main memory, but slower than other types of cached information. This provides a large on-processor tertiary memory storage area that the processor uses for keeping information nearby. Level 3 Cache - this type of caching is only available on some versions of the Pentium 4 Processor (notably the Pentium 4 Xeon processors). The Pentium 4 Processor Architecture includes multiple types and levels of caching: In this article we will describe the basics of the cache coherency mechanisms. This applies in processor design, and in the Intel Pentium 4 Processor architecture, caching is a critical component of the system's performance. This lowers the average cost of accessing the information, providing greater performance for the overall system. The NT Insider, Vol 11, Issue 1, Jan-Feb 2004 | Published: 12-Feb-04| Modified: 19-Mar-04Ī common technique for improving performance in computer systems (both hardware and software) is to utilize caching for frequently accessed information.
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