TCP with Van Jacobson congestion control (VJCC) is known to have poor performance over large bandwidthdelay product paths. Long delay paths, in particular, can display very poor behavior with VJCC slowly probing to acquire available capacity. TCP Performance Enhancing Proxies (PEPs) constitute one mechanism for ameliorating poor VJCC end-to-end performance by splitting TCP connections around a long-delay link or network and using alternate congestion control dynamics across the troublesome portion. Previous congestion control techniques for use over satellite links have typically constituted either tweaks to the Van Jacobson algorithms, Vegas-style congestion control, or disabling congestion control altogether in favor of a manual send-rate. This paper analyzes results from measurements of a new congestion control mechanism, the eXplicit Control protocol or XCP, between PEPs with a simulated geosynchronous satellite link in the path. We show that connections using an XCP PEP acquire their share of expensive satellite bandwidth up to 70 times faster than end-to-end TCP with VJCC.
-Starting Electronic System Level (ESL) design flows with executable High-Level Models (HLMs) has the potential to sustainably improve productivity. However, writing good HLMs for complex systems is still a challenging task. In the context of network controller design, modeling complexity has two major sources: (1) the functionality to handle a single connection, and (2) the number of connections to be handled in parallel. In this paper, we will propose an efficient actor-oriented modeling approach for complex systems by (1) integrating hierarchical FSMs into dynamic dataflow models, and (2) providing new channel types to allow concurrent processing of multiple connections. We will show the applicability of our proposed modeling approach to real-world system designs by presenting results from modeling and simulating a network controller for the Parallel Sysplex architecture used in IBM System z mainframes.
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