diff options
| author | Eric Dumazet <edumazet@google.com> | 2017-05-16 14:00:12 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-05-17 16:06:01 -0400 |
| commit | 46bf466f08c9db0db1b77d3ecb5694926c73583a (patch) | |
| tree | 6fde1cd1d871495e385d0e3091c1fa1075d951a6 /net/ipv4/tcp_lp.c | |
| parent | ad5ad69e6b48a7e5cc0391cc57c9e8a93a0c969c (diff) | |
| download | linux-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.c | 7 |
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 = { |