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A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. [1] A cache is a smaller, faster memory, located closer to a processor core, which stores copies of the data from frequently used main memory locations.
Cache hierarchy, or multi-level cache, is a memory architecture that uses a hierarchy of memory stores based on varying access speeds to cache data. Highly requested data is cached in high-speed access memory stores, allowing swifter access by central processing unit (CPU) cores.
Level 1 (L1) Data cache – 128 KiB [citation needed] [original research] in size. Best access speed is around 700 GB/s [9] Level 2 (L2) Instruction and data (shared) – 1 MiB [citation needed] [original research] in size. Best access speed is around 200 GB/s [9] Level 3 (L3) Shared cache – 6 MiB [citation needed] [original research] in size.
Since the cache exists to bridge the speed gap, its performance measurement and metrics are important in designing and choosing various parameters like cache size, associativity, replacement policy, etc. Cache performance depends on cache hits and cache misses, which are the factors that create constraints to system performance. Cache hits are ...
A cache also increases transfer performance. A part of the increase similarly comes from the possibility that multiple small transfers will combine into one large block. But the main performance-gain occurs because there is a good chance that the same data will be read from cache multiple times, or that written data will soon be read.
Performance; Max. CPU clock rate: 2.4 GHz to 3.0 GHz in phones and 3.3 GHz in tablets/laptops Cache; L1 cache: 32–64 KB (parity) 32kb L1 Instruction cache and 32kb L1 Data cache. or 64kb L1 Instruction cache and 64kb L1 Data cache. L2 cache: 256–512 (private L2 ECC) KiB: L3 cache: Optional, 512 KB to 4 MB (up to 8 MB) with Cortex-X1
L2 cache is important for the Lion Cove core architecture as Intel's reliance on L2 cache is to insulate the cores from the L3 cache's slow performance. [8] Lion Cove was designed to accommodate L2 caches configurable from 2.5 MB up to 3 MB depending on the product.
L1 cache L2 cache FPU speed Pipeline stages Typical power Voltage ... L2 cache [K] L1 I/D cache [K] Performance [SPEC2000] QuadCore: QuadCore: Isaiah 1000-1460: 1066 ...