突发万维网(WWW)源在ABR上的性能
Performance of Bursty World Wide Web (WWW) Sources over ABR
摘要:
我们的模型万维网(WWW)服务器和客户端运行在ATM网络上使用ABR(可用比特率)服务。WWW服务器使用SPECweb96基准的变体建模,而WWW客户端基于Mah的模型。由该应用生成的业务通常是突发的,即,它在传输中具有活动和空闲周期。在给定的空闲时间段之后发生超时。在空闲期间,底层TCP拥塞窗口保持打开,直到超时到期。这些打开的窗口可用于在应用程序再次变为活动时以突发方式发送数据。如果源速率不受ABR控制,这就增加了大交换机队列的可能性。我们研究了这个问题,并表明,ABR规模以及大量的突发TCP源系统中。
英文摘要:
We model World Wide Web (WWW) servers and clients running over an ATM network using the ABR (available bit rate) service. The WWW servers are modeled using a variant of the SPECweb96 benchmark, while the WWW clients are based on a model by Mah. The traffic generated by this application is typically bursty, i.e., it has active and idle periods in transmission. A timeout occurs after given amount of idle period. During idle period the underlying TCP congestion windows remain open until a timeout expires. These open windows may be used to send data in a burst when the application becomes active again. This raises the possibility of large switch queues if the source rates are not controlled by ABR. We study this problem and show that ABR scales well with a large number of bursty TCP sources in the system.
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