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authorStephen Hemminger <shemminger@osdl.org>2005-11-10 16:53:30 -0800
committerDavid S. Miller <davem@davemloft.net>2005-11-10 16:53:30 -0800
commitf4805eded7d38c4e42bf473dc5eb2f34853beb06 (patch)
tree1f7e0e90642e775b4e8c2c47d84e2df8ce2de3c3 /net
parent6e6ece5dc6022e8086c565498d23511bbceda811 (diff)
[TCP]: fix congestion window update when using TSO deferal
TCP peformance with TSO over networks with delay is awful. On a 100Mbit link with 150ms delay, we get 4Mbits/sec with TSO and 50Mbits/sec without TSO. The problem is with TSO, we intentionally do not keep the maximum number of packets in flight to fill the window, we hold out to until we can send a MSS chunk. But, we also don't update the congestion window unless we have filled, as per RFC2861. This patch replaces the check for the congestion window being full with something smarter that accounts for TSO. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp_bic.c2
-rw-r--r--net/ipv4/tcp_cong.c2
-rw-r--r--net/ipv4/tcp_highspeed.c4
-rw-r--r--net/ipv4/tcp_htcp.c2
-rw-r--r--net/ipv4/tcp_hybla.c6
-rw-r--r--net/ipv4/tcp_output.c1
-rw-r--r--net/ipv4/tcp_scalable.c3
7 files changed, 11 insertions, 9 deletions
diff --git a/net/ipv4/tcp_bic.c b/net/ipv4/tcp_bic.c
index ae35e0609047..5af99b3ef5d7 100644
--- a/net/ipv4/tcp_bic.c
+++ b/net/ipv4/tcp_bic.c
@@ -217,7 +217,7 @@ static void bictcp_cong_avoid(struct sock *sk, u32 ack,
bictcp_low_utilization(sk, data_acked);
- if (in_flight < tp->snd_cwnd)
+ if (!tcp_is_cwnd_limited(sk, in_flight))
return;
if (tp->snd_cwnd <= tp->snd_ssthresh) {
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index bbf2d6624e89..0705b496c6b3 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -186,7 +186,7 @@ void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 rtt, u32 in_flight,
{
struct tcp_sock *tp = tcp_sk(sk);
- if (in_flight < tp->snd_cwnd)
+ if (!tcp_is_cwnd_limited(sk, in_flight))
return;
if (tp->snd_cwnd <= tp->snd_ssthresh) {
diff --git a/net/ipv4/tcp_highspeed.c b/net/ipv4/tcp_highspeed.c
index 6acc04bde080..5e56ad368dd2 100644
--- a/net/ipv4/tcp_highspeed.c
+++ b/net/ipv4/tcp_highspeed.c
@@ -111,12 +111,12 @@ static void hstcp_init(struct sock *sk)
}
static void hstcp_cong_avoid(struct sock *sk, u32 adk, u32 rtt,
- u32 in_flight, int good)
+ u32 in_flight, u32 pkts_acked)
{
struct tcp_sock *tp = tcp_sk(sk);
struct hstcp *ca = inet_csk_ca(sk);
- if (in_flight < tp->snd_cwnd)
+ if (!tcp_is_cwnd_limited(sk, in_flight))
return;
if (tp->snd_cwnd <= tp->snd_ssthresh) {
diff --git a/net/ipv4/tcp_htcp.c b/net/ipv4/tcp_htcp.c
index e47b37984e95..404a326ba345 100644
--- a/net/ipv4/tcp_htcp.c
+++ b/net/ipv4/tcp_htcp.c
@@ -207,7 +207,7 @@ static void htcp_cong_avoid(struct sock *sk, u32 ack, u32 rtt,
struct tcp_sock *tp = tcp_sk(sk);
struct htcp *ca = inet_csk_ca(sk);
- if (in_flight < tp->snd_cwnd)
+ if (!tcp_is_cwnd_limited(sk, in_flight))
return;
if (tp->snd_cwnd <= tp->snd_ssthresh) {
diff --git a/net/ipv4/tcp_hybla.c b/net/ipv4/tcp_hybla.c
index 77add63623df..40dbb3877510 100644
--- a/net/ipv4/tcp_hybla.c
+++ b/net/ipv4/tcp_hybla.c
@@ -100,12 +100,12 @@ static void hybla_cong_avoid(struct sock *sk, u32 ack, u32 rtt,
ca->minrtt = tp->srtt;
}
+ if (!tcp_is_cwnd_limited(sk, in_flight))
+ return;
+
if (!ca->hybla_en)
return tcp_reno_cong_avoid(sk, ack, rtt, in_flight, flag);
- if (in_flight < tp->snd_cwnd)
- return;
-
if (ca->rho == 0)
hybla_recalc_param(sk);
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index b907456a79f4..998f6416ef8b 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2058,3 +2058,4 @@ EXPORT_SYMBOL(tcp_connect);
EXPORT_SYMBOL(tcp_make_synack);
EXPORT_SYMBOL(tcp_simple_retransmit);
EXPORT_SYMBOL(tcp_sync_mss);
+EXPORT_SYMBOL(sysctl_tcp_tso_win_divisor);
diff --git a/net/ipv4/tcp_scalable.c b/net/ipv4/tcp_scalable.c
index 327770bf5522..a2fd25617d24 100644
--- a/net/ipv4/tcp_scalable.c
+++ b/net/ipv4/tcp_scalable.c
@@ -20,7 +20,8 @@ static void tcp_scalable_cong_avoid(struct sock *sk, u32 ack, u32 rtt,
u32 in_flight, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
- if (in_flight < tp->snd_cwnd)
+
+ if (!tcp_is_cwnd_limited(sk, in_flight))
return;
if (tp->snd_cwnd <= tp->snd_ssthresh) {