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On the Effects of Workstation Scheduling on ATM Cell Output

机译：工作站调度对ATM信元输出的影响

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摘要

In this paper, we report on how System V UNIX scheduling can affect the way a workstation outputs ATM cell traffic under various process loads. Whenever multiple processes run concurrently, process contention occurs that creates burstiness and affects a workstation's traffic output. Experiments using a generic sending process and an FTP file transfer were performed that reveal the scheduling contention effects on traffic flow. Our results show that contention can introduce significant cell delay which can be on the order of hundreds of milliseconds. In addition, burstiness occurs where cells are "clumped" together in a variable manner. The average cell output rate decreases with increasing process load, but there is a preference given to a process that transmits cells as opposed to CPU-intensive programs. The impact of scheduling on traffic shaping based on a leaky bucket is also examined. We show that improper selection of the shaping parameters can occur if change in the process load is ignored and if the initial transient associated with process start-up is not accounted for. Lastly, we make some comparisons between the scheduling algorithms of System V and 4.3 BSD UNIX.
机译：在本文中，我们报告了System V UNIX调度如何影响工作站在各种过程负载下输出ATM信元流量的方式。每当多个进程同时运行时，就会发生进程争用，这会导致突发性并影响工作站的流量输出。进行了使用通用发送过程和FTP文件传输的实验，揭示了调度争用对流量的影响。我们的结果表明，竞争可能会导致明显的信元延迟，该延迟可能会达到数百毫秒。另外，在以可变方式将细胞“聚集”在一起的情况下发生突发性。平均单元输出速率随进程负载的增加而降低，但是与CPU密集型程序相反，优先选择传输单元的进程。还检查了调度对基于泄漏桶的流量整形的影响。我们表明，如果忽略了过程负载的变化并且未考虑与过程启动相关的初始瞬变，则会出现对成形参数的选择不当的情况。最后，我们对System V和4.3 BSD UNIX的调度算法进行了比较。

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