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- Make net.inet.tcp.maxtcptw modifiable at run time.

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- If net.inet.tcp.maxtcptw was ever set explicitly, do
  not change it if kern.ipc.maxsockets is changed.
This commit is contained in:
Gleb Smirnoff 2006-09-05 12:08:47 +00:00
parent 654d6b2e0b
commit 1f1f90c3a7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=162031
2 changed files with 56 additions and 14 deletions
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35
sys/netinet/tcp_subr.c
View File

@ -178,8 +178,27 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_RW,
&tcp_isn_reseed_interval, 0, "Seconds between reseeding of ISN secret");
static int maxtcptw;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, maxtcptw, CTLFLAG_RDTUN,
&maxtcptw, 0, "Maximum number of compressed TCP TIME_WAIT entries");
static int
sysctl_maxtcptw(SYSCTL_HANDLER_ARGS)
{
int error, new;
if (maxtcptw == 0)
new = maxsockets / 5;
else
new = maxtcptw;
error = sysctl_handle_int(oidp, &new, sizeof(int), req);
if (error == 0 && req->newptr) {
if (new > maxtcptw) {
maxtcptw = new;
} else
error = EINVAL;
}
return (error);
}
SYSCTL_PROC(_net_inet_tcp, OID_AUTO, maxtcptw, CTLTYPE_INT|CTLFLAG_RW,
&maxtcptw, 0, sysctl_maxtcptw, "IU",
"Maximum number of compressed TCP TIME_WAIT entries");
/*
* TCP bandwidth limiting sysctls. Note that the default lower bound of
@ -259,7 +278,8 @@ tcp_zone_change(void *tag)
uma_zone_set_max(tcbinfo.ipi_zone, maxsockets);
uma_zone_set_max(tcpcb_zone, maxsockets);
uma_zone_set_max(tcptw_zone, maxsockets / 5);
if (maxtcptw == 0)
uma_zone_set_max(tcptw_zone, maxsockets / 5);
}
static int
@ -316,12 +336,13 @@ tcp_init(void)
tcpcb_zone = uma_zcreate("tcpcb", sizeof(struct tcpcb_mem),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
uma_zone_set_max(tcpcb_zone, maxsockets);
TUNABLE_INT_FETCH("net.inet.tcp.maxtcptw", &maxtcptw);
if (maxtcptw == 0)
maxtcptw = maxsockets / 5;
tcptw_zone = uma_zcreate("tcptw", sizeof(struct tcptw),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
uma_zone_set_max(tcptw_zone, maxtcptw);
TUNABLE_INT_FETCH("net.inet.tcp.maxtcptw", &maxtcptw);
if (maxtcptw == 0)
uma_zone_set_max(tcptw_zone, maxsockets / 5);
else
uma_zone_set_max(tcptw_zone, maxtcptw);
tcp_timer_init();
syncache_init();
tcp_hc_init();

35
sys/netinet/tcp_timewait.c
View File

@ -178,8 +178,27 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_RW,
&tcp_isn_reseed_interval, 0, "Seconds between reseeding of ISN secret");
static int maxtcptw;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, maxtcptw, CTLFLAG_RDTUN,
&maxtcptw, 0, "Maximum number of compressed TCP TIME_WAIT entries");
static int
sysctl_maxtcptw(SYSCTL_HANDLER_ARGS)
{
int error, new;
if (maxtcptw == 0)
new = maxsockets / 5;
else
new = maxtcptw;
error = sysctl_handle_int(oidp, &new, sizeof(int), req);
if (error == 0 && req->newptr) {
if (new > maxtcptw) {
maxtcptw = new;
} else
error = EINVAL;
}
return (error);
}
SYSCTL_PROC(_net_inet_tcp, OID_AUTO, maxtcptw, CTLTYPE_INT|CTLFLAG_RW,
&maxtcptw, 0, sysctl_maxtcptw, "IU",
"Maximum number of compressed TCP TIME_WAIT entries");
/*
* TCP bandwidth limiting sysctls. Note that the default lower bound of
@ -259,7 +278,8 @@ tcp_zone_change(void *tag)
uma_zone_set_max(tcbinfo.ipi_zone, maxsockets);
uma_zone_set_max(tcpcb_zone, maxsockets);
uma_zone_set_max(tcptw_zone, maxsockets / 5);
if (maxtcptw == 0)
uma_zone_set_max(tcptw_zone, maxsockets / 5);
}
static int
@ -316,12 +336,13 @@ tcp_init(void)
tcpcb_zone = uma_zcreate("tcpcb", sizeof(struct tcpcb_mem),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
uma_zone_set_max(tcpcb_zone, maxsockets);
TUNABLE_INT_FETCH("net.inet.tcp.maxtcptw", &maxtcptw);
if (maxtcptw == 0)
maxtcptw = maxsockets / 5;
tcptw_zone = uma_zcreate("tcptw", sizeof(struct tcptw),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
uma_zone_set_max(tcptw_zone, maxtcptw);
TUNABLE_INT_FETCH("net.inet.tcp.maxtcptw", &maxtcptw);
if (maxtcptw == 0)
uma_zone_set_max(tcptw_zone, maxsockets / 5);
else
uma_zone_set_max(tcptw_zone, maxtcptw);
tcp_timer_init();
syncache_init();
tcp_hc_init();