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tcp_lp: cache tcp_time_stamp 

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

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-05-16 14:00:12 -07:00 committed by David S. Miller
parent ad5ad69e6b
commit 46bf466f08
1 changed files with 4 additions and 3 deletions
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7
net/ipv4/tcp_lp.c
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@ -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 = {