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Subject[patch] use sysctl to adjust SOMAXCONN
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This patch allows the effective SOMAXCONN value to be adjusted
by sysctl, as net.core.listen_max. The user-space value remains
fixed at the current value of 128, so this should not affect the
behavior of applications by default. A value larger than 128 is
sometimes useful for benchmarking purposes, when lots of new TCP
connections are established at once.

-- kolya

--- linux-2.5.14/net/socket.c.orig Sun May 5 23:37:59 2002
+++ linux-2.5.14/net/socket.c Tue May 7 12:09:56 2002
@@ -1055,14 +1055,15 @@
* ready for listening.
*/

+int sysctl_listen_max = SOMAXCONN;
asmlinkage long sys_listen(int fd, int backlog)
{
struct socket *sock;
int err;

if ((sock = sockfd_lookup(fd, &err)) != NULL) {
- if ((unsigned) backlog > SOMAXCONN)
- backlog = SOMAXCONN;
+ if ((unsigned) backlog > sysctl_listen_max)
+ backlog = sysctl_listen_max;
err=sock->ops->listen(sock, backlog);
sockfd_put(sock);
}
--- linux-2.5.14/net/core/sysctl_net_core.c.orig Sun May 5 23:38:00 2002
+++ linux-2.5.14/net/core/sysctl_net_core.c Tue May 7 12:09:56 2002
@@ -29,6 +29,7 @@
extern int sysctl_core_destroy_delay;
extern int sysctl_optmem_max;
extern int sysctl_hot_list_len;
+extern int sysctl_listen_max;

#ifdef CONFIG_NET_DIVERT
extern char sysctl_divert_version[];
@@ -88,6 +89,9 @@
(void *)sysctl_divert_version, 32, 0444, NULL,
&proc_dostring},
#endif /* CONFIG_NET_DIVERT */
+ {NET_CORE_LISTEN_MAX, "listen_max",
+ &sysctl_listen_max, sizeof(int), 0644, NULL,
+ &proc_dointvec},
#endif /* CONFIG_NET */
{ 0 }
};
--- linux-2.5.14/include/linux/sysctl.h.orig Sun May 5 23:37:52 2002
+++ linux-2.5.14/include/linux/sysctl.h Tue May 7 12:10:34 2002
@@ -203,7 +203,8 @@
NET_CORE_NO_CONG=14,
NET_CORE_LO_CONG=15,
NET_CORE_MOD_CONG=16,
- NET_CORE_DEV_WEIGHT=17
+ NET_CORE_DEV_WEIGHT=17,
+ NET_CORE_LISTEN_MAX=18
};

/* /proc/sys/net/ethernet */
-
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