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Design and performance of compressed interconnects for high performance servers

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2 Author(s)
Kant, K. ; Enterprise Archit. Lab., Intel Labs., USA ; Iyer, R.

As microprocessors scale rapidly in frequency, the design of fast and efficient interconnects becomes extremely important for low latency data access and high performance. We evaluate a technique for reducing the interconnect width by exploiting the spatial and temporal locality in communication transfers (addresses & data). The width reduction implies a number of other advantages including higher operating frequency, reduced pin-count, lower chip & board cost, etc. We evaluate the effectiveness of the proposed scheme by performing trace-driven simulations for two well-known commercial server workloads (SPECWeb99 and TPC-C). We also study the sensitivity of the compression hit ratio with respect to the number of bits compressed, size of the encoding/decoding table used and the replacement policy. The results indicate that the proposed technique has a potential to reduce address bus width in most cases and data bus widths in some cases while maintaining equal or better performance than in the uncompressed case.

Published in:

Computer Design, 2003. Proceedings. 21st International Conference on

Date of Conference:

13-15 Oct. 2003

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