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F E A T U R E

AppCelera Burns Up the Last Mile

November 26, 2001
By Lori MacVittie

Slow Users, Slow Server


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Each Web server's HTTP connection has a RecvQ and a SendQ: The RecvQ receives requests, and the SendQ holds the data to be retrieved by the client. The combination of a large image or text file and a slow connection means the SendQ will take a long time to empty. If a SendQ is open, the connection cannot be closed. Because a Web server can have a limited number of connections open at any given time, large numbers of clients using slow modems could tie up a Web server easily by forcing it to wait for the SendQs to empty.