Performance of Memory Expansion Technology (MXT)
A novel memory subsystem called Memory Expansion Technology (MXT) has been built for fast hardware compression of main memory contents. This allows a system with memory expansion to present a real memory larger than the physically available memory. This chapter provides an overview of the memory compression architecture, the OS support, and an analysis of the performance impact of memory compression while running multiple benchmarks. Results show that the hardware compression of main memory has a negligible penalty compared to an uncompressed memory, and for memory starved applications it increases performance significantly. We also show that an applications’ memory contents can be compressed usually by a factor of 2.
KeywordsVortex Compressibility Dispatch Adapter
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