This paper presents three new results concerning credit-based jlow control for ATIU network:(1) a simple and robust credit up~te pro@col (CUP) suited for relatively inexpensive hardwarei so+are implementation;(2) automatic adaptation of credit bufjer allocation for virtual circuits (VCS) sharing the same bujfer pool;(3) use of credit-based$ow control to improve the effectiveness of statistical multipltning in mim"mizing switch memory. These results hme been substantiated by anulysis, simulation and implementation.

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Many techniques have been discovered to improve performance of bulk data transfer protocols which use large messages. This paper describes a technique that improves protocol performance for protocols that use small messages, such as signalling protocols, by reducing memory system penalties. Detailed measurements show that for TCP, most memory system costs are due to poor locality in the protocol code itself, rather than movement of data. We present a new technique, analogous to blocked matrix multiplication, for scheduling layer processing to reduce memory system costs, and analyze its performance in a synthetic environment.Appears in ACM SIGCOMM '96.