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authorYuchung Cheng <ycheng@google.com>2015-07-09 23:16:30 +0300
committerDavid S. Miller <davem@davemloft.net>2015-07-10 00:22:52 +0300
commit76174004a0f19785a328f40388e87e982bbf69b9 (patch)
tree113a691ab55819f20b367cdeb8ba86440aa62177 /net/ipv4/tcp_hybla.c
parent071d5080e33d6f24139e4213c2d9f97a2c21b602 (diff)
downloadlinux-76174004a0f19785a328f40388e87e982bbf69b9.tar.xz
tcp: do not slow start when cwnd equals ssthresh
In the original design slow start is only used to raise cwnd when cwnd is stricly below ssthresh. It makes little sense to slow start when cwnd == ssthresh: especially when hystart has set ssthresh in the initial ramp, or after recovery when cwnd resets to ssthresh. Not doing so will also help reduce the buffer bloat slightly. Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Nandita Dukkipati <nanditad@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_hybla.c')
-rw-r--r--net/ipv4/tcp_hybla.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_hybla.c b/net/ipv4/tcp_hybla.c
index f963b274f2b0..083831e359df 100644
--- a/net/ipv4/tcp_hybla.c
+++ b/net/ipv4/tcp_hybla.c
@@ -112,7 +112,7 @@ static void hybla_cong_avoid(struct sock *sk, u32 ack, u32 acked)
rho_fractions = ca->rho_3ls - (ca->rho << 3);
- if (tp->snd_cwnd < tp->snd_ssthresh) {
+ if (tcp_in_slow_start(tp)) {
/*
* slow start
* INC = 2^RHO - 1