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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 /net/ipv4/af_inet.c
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 'net/ipv4/af_inet.c')
-rw-r--r--net/ipv4/af_inet.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index edcf0932ac6d..4a81d54a7569 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -204,7 +204,7 @@ int inet_listen(struct socket *sock, int backlog)
204 * we can only allow the backlog to be adjusted. 204 * we can only allow the backlog to be adjusted.
205 */ 205 */
206 if (old_state != TCP_LISTEN) { 206 if (old_state != TCP_LISTEN) {
207 err = inet_csk_listen_start(sk, TCP_SYNQ_HSIZE); 207 err = inet_csk_listen_start(sk, backlog);
208 if (err) 208 if (err)
209 goto out; 209 goto out;
210 } 210 }