The default method for calculating the number of connections allowed
per RPC service arbitrarily limits single-threaded services to 80
connections. This is too low for services like lockd and artificially
limits the number of TCP clients that it can support.
Have lockd set a default sv_maxconn value to 1024 (which is the typical
default value for RLIMIT_NOFILE. Also add a module parameter to allow an
admin to set this to an arbitrary value.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/lockd/svc.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index c631a83..e804155 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -62,6 +62,9 @@ static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
static int nlm_udpport, nlm_tcpport;
int nsm_use_hostnames = 0;
+/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
+static unsigned int nlm_max_connections = 1024;
+
/*
* Constants needed for the sysctl interface.
*/
@@ -143,6 +146,9 @@ lockd(void *vrqstp)
long timeout = MAX_SCHEDULE_TIMEOUT;
RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
+ /* update sv_maxconn if it has changed */
+ rqstp->rq_server->sv_maxconn = nlm_max_connections;
+
if (signalled()) {
flush_signals(current);
if (nlmsvc_ops) {
@@ -275,6 +281,7 @@ int lockd_up(void)
}
svc_sock_update_bufs(serv);
+ serv->sv_maxconn = nlm_max_connections;
nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
if (IS_ERR(nlmsvc_task)) {
@@ -484,6 +491,7 @@ module_param_call(nlm_udpport, param_set_port, param_get_int,
module_param_call(nlm_tcpport, param_set_port, param_get_int,
&nlm_tcpport, 0644);
module_param(nsm_use_hostnames, bool, 0644);
+module_param(nlm_max_connections, uint, 0644);
/*
* Initialising and terminating the module.
--
1.5.5.1
--
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