tcp: tsq: avoid one atomic in tcp_wfree()
Under high load, tcp_wfree() has an atomic operation trying to schedule a tasklet over and over. We can schedule it only if our per cpu list was empty. Signed-off-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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