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tcp: Increase the initial congestion window to 10.

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Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Nandita Dukkipati <nanditad@google.com>
This commit is contained in:
David S. Miller 2011-02-02 17:05:11 -08:00
parent 5ea74318c6
commit 442b9635c5
3 changed files with 13 additions and 10 deletions
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12
include/net/tcp.h
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@ -196,6 +196,9 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
/* TCP thin-stream limits */ /* TCP thin-stream limits */
#define TCP_THIN_LINEAR_RETRIES 6 /* After 6 linear retries, do exp. backoff */ #define TCP_THIN_LINEAR_RETRIES 6 /* After 6 linear retries, do exp. backoff */
/* TCP initial congestion window */
#define TCP_INIT_CWND 10
extern struct inet_timewait_death_row tcp_death_row; extern struct inet_timewait_death_row tcp_death_row;
/* sysctl variables for tcp */ /* sysctl variables for tcp */
@ -799,15 +802,6 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk)
/* Use define here intentionally to get WARN_ON location shown at the caller */ /* Use define here intentionally to get WARN_ON location shown at the caller */
#define tcp_verify_left_out(tp) WARN_ON(tcp_left_out(tp) > tp->packets_out) #define tcp_verify_left_out(tp) WARN_ON(tcp_left_out(tp) > tp->packets_out)
/*
* Convert RFC 3390 larger initial window into an equivalent number of packets.
* This is based on the numbers specified in RFC 5681, 3.1.
*/
static inline u32 rfc3390_bytes_to_packets(const u32 smss)
{
return smss <= 1095 ? 4 : (smss > 2190 ? 2 : 3);
}
extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh); extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh);
extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst); extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst);

9
net/dccp/ccids/ccid2.c
View file

@ -583,6 +583,15 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
dccp_ackvec_parsed_cleanup(&hc->tx_av_chunks); dccp_ackvec_parsed_cleanup(&hc->tx_av_chunks);
} }
/*
* Convert RFC 3390 larger initial window into an equivalent number of packets.
* This is based on the numbers specified in RFC 5681, 3.1.
*/
static inline u32 rfc3390_bytes_to_packets(const u32 smss)
{
return smss <= 1095 ? 4 : (smss > 2190 ? 2 : 3);
}
static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk) static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
{ {
struct ccid2_hc_tx_sock *hc = ccid_priv(ccid); struct ccid2_hc_tx_sock *hc = ccid_priv(ccid);

2
net/ipv4/tcp_input.c
View file

@ -817,7 +817,7 @@ __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst)
__u32 cwnd = (dst ? dst_metric(dst, RTAX_INITCWND) : 0); __u32 cwnd = (dst ? dst_metric(dst, RTAX_INITCWND) : 0);
if (!cwnd) if (!cwnd)
cwnd = rfc3390_bytes_to_packets(tp->mss_cache); cwnd = TCP_INIT_CWND;
return min_t(__u32, cwnd, tp->snd_cwnd_clamp); return min_t(__u32, cwnd, tp->snd_cwnd_clamp);
} }