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Commit 8e82376e authored by Andy Grover's avatar Andy Grover Committed by David S. Miller
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RDS/TCP: Wait to wake thread when write space available 



Instead of waking the send thread whenever any send space is available,
wait until it is at least half empty. This is modeled on how
sock_def_write_space() does it, and may help to minimize context
switches.

Signed-off-by: default avatarAndy Grover <andy.grover@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b075cfdb

net/rds/tcp_send.c

+3 −1
Original line number Diff line number Diff line
@@ -240,7 +240,9 @@ void rds_tcp_write_space(struct sock *sk) 
	tc->t_last_seen_una = rds_tcp_snd_una(tc);

	rds_send_drop_acked(conn, rds_tcp_snd_una(tc), rds_tcp_is_acked);



        if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf)

		queue_delayed_work(rds_wq, &conn->c_send_w, 0);



out:

	read_unlock(&sk->sk_callback_lock);