Many commercial web sites, as web stores, have recently experienced performance problems due to the growth of Internet trading. One way to improve a site's performance during overload is to introduce admission control mechanisms. In this paper we develop and investigate two admission control schemes specifically for distributed commercial web sites. One of the schemes isrequest-based and the other one is session-based. A queuing network model is used to investigate a distributed site representing a web store. We find that both schemes improve the site's performance during overIoad. However, while the sessionbased control scheme guarantees a good customer QoS, the request-based scheme generates a large amount of so called angry customers.

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