diff options
| author | Eric Dumazet <dada1@cosmosbay.com> | 2006-11-16 02:30:37 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-12-02 21:21:44 -0800 |
| commit | 72a3effaf633bcae9034b7e176bdbd78d64a71db (patch) | |
| tree | b7a331527f1b15335a358f97809134f35587e57a /include/net | |
| parent | 3c62f75aac7348ee262b1295cfcfeb3473f76815 (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.h | 8 | ||||
| -rw-r--r-- | include/net/tcp.h | 1 |
2 files changed, 4 insertions, 5 deletions
diff --git a/include/net/request_sock.h b/include/net/request_sock.h index f743a941a4f2..b5b023e79e5f 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 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); #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 |