| Publisher | University of California | ||
|---|---|---|---|
| Format | 809.2KB PDF | Date added | 21 Dec 2002 |
| Topics | Local Area Networks (LAN), Wide Area Networks (WAN), TCP - IP | ||
| Downloads | 16 | ||
This paper presents detailed measurements of processing overheads for the Ultrix 4.2a implementation of TCP/IP network software running on a DECstation 5000/200. The performance results were used to uncover throughput and latency bottlenecks. This paper presents a scheme for improving throughput when sending large messages by a voiding most checksum computations in a relatively safe manner. It also shows that for the implementation studied, reducing latency (when sending small messages) is a more difficult problem because processing overheads are spread over many operations; gaining a significant savings would require the optimization of many different mechanisms. This is especially important because, when processing a realistic workload, it was found that non-data-touching operations consume more time in aggregate than data-touching operations.
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