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authorDavid S. Miller <davem@davemloft.net>2005-07-05 18:21:10 -0400
committerDavid S. Miller <davem@davemloft.net>2005-07-05 18:21:10 -0400
commit0d9901df62fe4820aee86b49f1a074cdb5c6928e (patch)
tree747e4af9c87477d58cdbb07196a35e2954da2a9f /net/ipv4/tcp_input.c
parentcb83199a29dc0408423d6df432f28cc67fcadaf4 (diff)
[TCP]: Break out send buffer expansion test.
This makes it easier to understand, and allows easier tweaking of the heuristic later on. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r--net/ipv4/tcp_input.c27
1 files changed, 23 insertions, 4 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index b948e4eb39b7..2ef2f355b8b8 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3300,6 +3300,28 @@ void tcp_cwnd_application_limited(struct sock *sk)
3300 tp->snd_cwnd_stamp = tcp_time_stamp; 3300 tp->snd_cwnd_stamp = tcp_time_stamp;
3301} 3301}
3302 3302
3303static inline int tcp_should_expand_sndbuf(struct sock *sk, struct tcp_sock *tp)
3304{
3305 /* If the user specified a specific send buffer setting, do
3306 * not modify it.
3307 */
3308 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK)
3309 return 0;
3310
3311 /* If we are under global TCP memory pressure, do not expand. */
3312 if (tcp_memory_pressure)
3313 return 0;
3314
3315 /* If we are under soft global TCP memory pressure, do not expand. */
3316 if (atomic_read(&tcp_memory_allocated) >= sysctl_tcp_mem[0])
3317 return 0;
3318
3319 /* If we filled the congestion window, do not expand. */
3320 if (tp->packets_out >= tp->snd_cwnd)
3321 return 0;
3322
3323 return 1;
3324}
3303 3325
3304/* When incoming ACK allowed to free some skb from write_queue, 3326/* When incoming ACK allowed to free some skb from write_queue,
3305 * we remember this event in flag SOCK_QUEUE_SHRUNK and wake up socket 3327 * we remember this event in flag SOCK_QUEUE_SHRUNK and wake up socket
@@ -3311,10 +3333,7 @@ static void tcp_new_space(struct sock *sk)
3311{ 3333{
3312 struct tcp_sock *tp = tcp_sk(sk); 3334 struct tcp_sock *tp = tcp_sk(sk);
3313 3335
3314 if (tp->packets_out < tp->snd_cwnd && 3336 if (tcp_should_expand_sndbuf(sk, tp)) {
3315 !(sk->sk_userlocks & SOCK_SNDBUF_LOCK) &&
3316 !tcp_memory_pressure &&
3317 atomic_read(&tcp_memory_allocated) < sysctl_tcp_mem[0]) {
3318 int sndmem = max_t(u32, tp->rx_opt.mss_clamp, tp->mss_cache_std) + 3337 int sndmem = max_t(u32, tp->rx_opt.mss_clamp, tp->mss_cache_std) +
3319 MAX_TCP_HEADER + 16 + sizeof(struct sk_buff), 3338 MAX_TCP_HEADER + 16 + sizeof(struct sk_buff),
3320 demanded = max_t(unsigned int, tp->snd_cwnd, 3339 demanded = max_t(unsigned int, tp->snd_cwnd,