tcp: use current time in tcp_rcv_space_adjust()
When I switched rcv_rtt_est to high resolution timestamps, I forgot that tp->tcp_mstamp needed to be refreshed in tcp_rcv_space_adjust() Using an old timestamp leads to autotuning lags. Fixes: 645f4c6f ("tcp: switch rcv_rtt_est and rcvq_space to high resolution timestamps") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Wei Wang <weiwan@google.com> Cc: Neal Cardwell <ncardwell@google.com> Cc: Yuchung Cheng <ycheng@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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