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Performance Tradeoffs of TCP Selective Acknowledgment

Apr 10, 2008, 04:30 (0 Talkback[s])
(Other stories by Patrick McManus)

[ Thanks to LinucksGirl for this link. ]

"Mixed in with the usual Linux development chatter on the Internet over the last few months has been a significant discussion of Linux's TCP SACK (Selective Acknowledgment) implementation. These comments have generally focused on the performance of the TCP stack when processing certain SACK events, and some people have hinted at the presence of a security exposure.

"I was intrigued by the discussion, but it seemed to lack hard data. What specific conditions were they talking about? Is this a minor performance nit, or is it an outright server denial-of-service (DoS) opportunity...?"

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