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Commit 46bf466f authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

tcp_lp: cache tcp_time_stamp 



tcp_time_stamp will become slightly more expensive soon,
cache its value.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ad5ad69e

net/ipv4/tcp_lp.c

+4 −3
Original line number Diff line number Diff line
@@ -264,18 +264,19 @@ static void tcp_lp_pkts_acked(struct sock *sk, const struct ack_sample *sample) 
{

	struct tcp_sock *tp = tcp_sk(sk);

	struct lp *lp = inet_csk_ca(sk);

	u32 now = tcp_time_stamp;

	u32 delta;



	if (sample->rtt_us > 0)

		tcp_lp_rtt_sample(sk, sample->rtt_us);



	/* calc inference */

	delta = tcp_time_stamp - tp->rx_opt.rcv_tsecr;

	delta = now - tp->rx_opt.rcv_tsecr;

	if ((s32)delta > 0)

		lp->inference = 3 * delta;



	/* test if within inference */

	if (lp->last_drop && (tcp_time_stamp - lp->last_drop < lp->inference))

	if (lp->last_drop && (now - lp->last_drop < lp->inference))

		lp->flag |= LP_WITHIN_INF;

	else

		lp->flag &= ~LP_WITHIN_INF;
@@ -312,7 +313,7 @@ static void tcp_lp_pkts_acked(struct sock *sk, const struct ack_sample *sample) 
		tp->snd_cwnd = max(tp->snd_cwnd >> 1U, 1U);



	/* record this drop time */

	lp->last_drop = tcp_time_stamp;

	lp->last_drop = now;

}



static struct tcp_congestion_ops tcp_lp __read_mostly = {