tcp: generate CA_EVENT_TX_START on data frames
Issuing a CC TX_START event on control frames like pure ACK is a waste of time, as a CC should not care. Following patch needs this change, as we want CUBIC to properly track idle time at a low cost, with a single TX_START being generated. Yuchung might slightly refine the condition triggering TX_START on a followup patch. Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Cc: Jana Iyengar <jri@google.com> Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: Sangtae Ha <sangtae.ha@gmail.com> Cc: Lawrence Brakmo <lawrence@brakmo.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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