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-rw-r--r--net/core/request_sock.c16
-rw-r--r--net/ipv4/tcp_ipv4.c16
2 files changed, 16 insertions, 16 deletions
diff --git a/net/core/request_sock.c b/net/core/request_sock.c
index 78fd60a46bf2..bb55675f0685 100644
--- a/net/core/request_sock.c
+++ b/net/core/request_sock.c
@@ -18,6 +18,22 @@
18 18
19#include <net/request_sock.h> 19#include <net/request_sock.h>
20 20
21/*
22 * Maximum number of SYN_RECV sockets in queue per LISTEN socket.
23 * One SYN_RECV socket costs about 80bytes on a 32bit machine.
24 * It would be better to replace it with a global counter for all sockets
25 * but then some measure against one socket starving all other sockets
26 * would be needed.
27 *
28 * It was 128 by default. Experiments with real servers show, that
29 * it is absolutely not enough even at 100conn/sec. 256 cures most
30 * of problems. This value is adjusted to 128 for very small machines
31 * (<=32Mb of memory) and to 1024 on normal or better ones (>=256Mb).
32 * Further increasing requires to change hash table size.
33 */
34int sysctl_max_syn_backlog = 256;
35EXPORT_SYMBOL(sysctl_max_syn_backlog);
36
21int reqsk_queue_alloc(struct request_sock_queue *queue, 37int reqsk_queue_alloc(struct request_sock_queue *queue,
22 const int nr_table_entries) 38 const int nr_table_entries)
23{ 39{
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 485ca9cb1707..2d41d5d6ad19 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1366,21 +1366,6 @@ static inline struct ip_options *tcp_v4_save_options(struct sock *sk,
1366 return dopt; 1366 return dopt;
1367} 1367}
1368 1368
1369/*
1370 * Maximum number of SYN_RECV sockets in queue per LISTEN socket.
1371 * One SYN_RECV socket costs about 80bytes on a 32bit machine.
1372 * It would be better to replace it with a global counter for all sockets
1373 * but then some measure against one socket starving all other sockets
1374 * would be needed.
1375 *
1376 * It was 128 by default. Experiments with real servers show, that
1377 * it is absolutely not enough even at 100conn/sec. 256 cures most
1378 * of problems. This value is adjusted to 128 for very small machines
1379 * (<=32Mb of memory) and to 1024 on normal or better ones (>=256Mb).
1380 * Further increasing requires to change hash table size.
1381 */
1382int sysctl_max_syn_backlog = 256;
1383
1384struct request_sock_ops tcp_request_sock_ops = { 1369struct request_sock_ops tcp_request_sock_ops = {
1385 .family = PF_INET, 1370 .family = PF_INET,
1386 .obj_size = sizeof(struct tcp_request_sock), 1371 .obj_size = sizeof(struct tcp_request_sock),
@@ -2662,7 +2647,6 @@ EXPORT_SYMBOL(tcp_proc_register);
2662EXPORT_SYMBOL(tcp_proc_unregister); 2647EXPORT_SYMBOL(tcp_proc_unregister);
2663#endif 2648#endif
2664EXPORT_SYMBOL(sysctl_local_port_range); 2649EXPORT_SYMBOL(sysctl_local_port_range);
2665EXPORT_SYMBOL(sysctl_max_syn_backlog);
2666EXPORT_SYMBOL(sysctl_tcp_low_latency); 2650EXPORT_SYMBOL(sysctl_tcp_low_latency);
2667EXPORT_SYMBOL(sysctl_tcp_tw_reuse); 2651EXPORT_SYMBOL(sysctl_tcp_tw_reuse);
2668 2652