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Priyaranjan Jha says: ==================== tcp: improve handling of DSACK covering multiple segments Currently, while processing DSACK, we assume DSACK covers only one segment. This leads to significant underestimation of no. of duplicate segments with LRO/GRO. Also, the existing SNMP counters, TCPDSACKRecv and TCPDSACKOfoRecv, make similar assumption for DSACK, which makes them unusable for estimating spurious retransmit rates. This patch series fixes the segment accounting with DSACK, by estimating number of duplicate segments based on: (DSACKed sequence range) / MSS. It also introduces a new SNMP counter, TCPDSACKRecvSegs, which tracks the estimated number of duplicate segments. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
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