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authorEric Dumazet <edumazet@google.com>2017-05-16 14:00:12 -0700
committerDavid S. Miller <davem@davemloft.net>2017-05-17 16:06:01 -0400
commit46bf466f08c9db0db1b77d3ecb5694926c73583a (patch)
tree6fde1cd1d871495e385d0e3091c1fa1075d951a6 /net/ipv4/tcp_lp.c
parentad5ad69e6b48a7e5cc0391cc57c9e8a93a0c969c (diff)
downloadlinux-46bf466f08c9db0db1b77d3ecb5694926c73583a.tar.bz2
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>
Diffstat (limited to 'net/ipv4/tcp_lp.c')
-rw-r--r--net/ipv4/tcp_lp.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv4/tcp_lp.c b/net/ipv4/tcp_lp.c
index d6fb6c067af4..ef3122abb373 100644
--- a/net/ipv4/tcp_lp.c
+++ b/net/ipv4/tcp_lp.c
@@ -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 = {