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authorEric Dumazet <dada1@cosmosbay.com>2006-11-16 02:30:37 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-02 21:21:44 -0800
commit72a3effaf633bcae9034b7e176bdbd78d64a71db (patch)
treeb7a331527f1b15335a358f97809134f35587e57a /include/net
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')
-rw-r--r--include/net/request_sock.h8
-rw-r--r--include/net/tcp.h1
2 files changed, 4 insertions, 5 deletions
diff --git a/include/net/request_sock.h b/include/net/request_sock.h
index f743a941a4f..b5b023e79e5 100644
--- a/include/net/request_sock.h
+++ b/include/net/request_sock.h
@@ -28,8 +28,8 @@ struct proto;
struct request_sock_ops {
int family;
- kmem_cache_t *slab;
int obj_size;
+ kmem_cache_t *slab;
int (*rtx_syn_ack)(struct sock *sk,
struct request_sock *req,
struct dst_entry *dst);
@@ -51,13 +51,13 @@ struct request_sock {
u32 rcv_wnd; /* rcv_wnd offered first time */
u32 ts_recent;
unsigned long expires;
- struct request_sock_ops *rsk_ops;
+ const struct request_sock_ops *rsk_ops;
struct sock *sk;
u32 secid;
u32 peer_secid;
};
-static inline struct request_sock *reqsk_alloc(struct request_sock_ops *ops)
+static inline struct request_sock *reqsk_alloc(const struct request_sock_ops *ops)
{
struct request_sock *req = kmem_cache_alloc(ops->slab, SLAB_ATOMIC);
@@ -121,7 +121,7 @@ struct request_sock_queue {
};
extern int reqsk_queue_alloc(struct request_sock_queue *queue,
- const int nr_table_entries);
+ unsigned int nr_table_entries);
static inline struct listen_sock *reqsk_queue_yank_listen_sk(struct request_sock_queue *queue)
{
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 7a093d0aa0f..246916c2321 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);
#define MAX_TCP_SYNCNT 127
#define TCP_SYNQ_INTERVAL (HZ/5) /* Period of SYNACK timer */
-#define TCP_SYNQ_HSIZE 512 /* Size of SYNACK hash table */
#define TCP_PAWS_24DAYS (60 * 60 * 24 * 24)
#define TCP_PAWS_MSL 60 /* Per-host timestamps are invalidated