tcp: switch tcp_internal_pacing() to tcp_wstamp_ns
Now TCP keeps track of tcp_wstamp_ns, recording the earliest departure time of next packet, we can remove duplicate code from tcp_internal_pacing() This removes one ktime_get_tai_ns() call, and a divide. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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