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SubjectRe: unnecessary retransmit from network stack
   From: Christian Widmer <>
Date: Fri, 5 Oct 2001 14:29:53 +0200

why does net_dev.hard_start_xmit get called multiple times
with the same tcp packet?

Because the ACK is not coming back for those packets within the RTO
(which for a local network is very low). Check your TCP dumps,
the ACKs of the original data packets are being dropped in transit.

Franks a lot,
David S. Miller
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