aboutsummaryrefslogtreecommitdiffstats
path: root/include/net/tcp.h
diff options
context:
space:
mode:
authorEric Dumazet <dada1@cosmosbay.com>2006-11-16 05:30:37 -0500
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-03 00:21:44 -0500
commit72a3effaf633bcae9034b7e176bdbd78d64a71db (patch)
treeb7a331527f1b15335a358f97809134f35587e57a /include/net/tcp.h
parent3c62f75aac7348ee262b1295cfcfeb3473f76815 (diff)
[NET]: Size listen hash tables using backlog hint
We currently allocate a fixed size (TCP_SYNQ_HSIZE=512) slots hash table for each LISTEN socket, regardless of various parameters (listen backlog for example) On x86_64, this means order-1 allocations (might fail), even for 'small' sockets, expecting few connections. On the contrary, a huge server wanting a backlog of 50000 is slowed down a bit because of this fixed limit. This patch makes the sizing of listen hash table a dynamic parameter, depending of : - net.core.somaxconn tunable (default is 128) - net.ipv4.tcp_max_syn_backlog tunable (default : 256, 1024 or 128) - backlog value given by user application (2nd parameter of listen()) For large allocations (bigger than PAGE_SIZE), we use vmalloc() instead of kmalloc(). We still limit memory allocation with the two existing tunables (somaxconn & tcp_max_syn_backlog). So for standard setups, this patch actually reduce RAM usage. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tcp.h')
-rw-r--r--include/net/tcp.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 7a093d0aa0fe..246916c2321e 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -138,7 +138,6 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
138#define MAX_TCP_SYNCNT 127 138#define MAX_TCP_SYNCNT 127
139 139
140#define TCP_SYNQ_INTERVAL (HZ/5) /* Period of SYNACK timer */ 140#define TCP_SYNQ_INTERVAL (HZ/5) /* Period of SYNACK timer */
141#define TCP_SYNQ_HSIZE 512 /* Size of SYNACK hash table */
142 141
143#define TCP_PAWS_24DAYS (60 * 60 * 24 * 24) 142#define TCP_PAWS_24DAYS (60 * 60 * 24 * 24)
144#define TCP_PAWS_MSL 60 /* Per-host timestamps are invalidated 143#define TCP_PAWS_MSL 60 /* Per-host timestamps are invalidated