What is the tertiary cache?

ByRandy Willey 2019-12-28 1141

Level 3 cache is designed for data missed after reading level 2 cache. In CPU with level 3 cache, only about 5% of the data needs to be called from memory, which further improves the efficiency of CPU. Its operation principle is to use a faster storage device to retain a copy of the data read from the slow storage device and copy it. When it is necessary to read and write data from the slower storage body, the cache (cache) can make the read and write action be completed on the fast device first, which will make the response of the system faster.

The tertiary cache classified

Cache (three-tier cache) is divided into two types, the early one is external, and the later upgrade products are built-in. Its practical function is that the application of L3 cache can further reduce memory latency and improve the performance of processors when computing large amounts of data. Reducing memory latency and improving the computing power of large amounts of data are very helpful to the game. On the other hand, there is still a significant improvement in the performance of L3 cache in the server area. For example, a configuration with a larger L3 cache is more efficient to use physical memory, so its slower disk Icano subsystem can handle more data requests. Processors with larger L3 caches provide more efficient file system caching behavior and shorter message and processor queue lengths.

In fact, the earliest L3 cache was applied to the K6-III processor released by AMD. At that time, the L3 cache was limited by the manufacturing process and was not integrated into the chip, but on the motherboard. In fact, the L3 cache, which can only synchronize with the frequency of the system bus, is not much different from the main memory. The one that later used the L3 cache was Intel's Itanium processor for the server market. Then there are P4EE and Zhiqiang MP. Intel also plans to introduce a 9MB L3 cached Itanium2 processor and a future 24MB L3 cached dual-core Itanium2 processor.

But basically, L3 cache is not very important to improve the performance of the processor. For example, the Xeon MP processor equipped with 1MB L3 cache is still no match for Opteron, so it can be seen that the increase of front-end bus brings more effective performance improvement than the increase of cache.

The tertiary cache performance impact

The impact of three-level cache on performance is sometimes high and sometimes low. In terms of games, increasing the capacity of the third-level cache has a great impact on the performance of the game, although it is of no use to ordinary household machines, but if it is a net bar machine or a fever machine to improve the capacity of the third-level cache, there will be a significant performance improvement. Although level 3 cache can also bring significant performance improvement to PC, after all, level 3 cache acts on the server, and level 3 cache can only play a supplementary role for PC. When other parameters are the same, the larger the level 3 cache capacity, the better the performance. If the other parameters are not the same, the effect of level 3 cache is not obvious.

Whether the role of three-level cache is great or not, it is also one of the parameters that contribute to the development of computers.

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