[PATCH] nfsd: allow more than 64 backlogged connections

[trondmy@gmail.com]

From: Trond Myklebust <trond.myklebust@hammerspace.com>

When creating a listener socket to be handed to /proc/fs/nfsd/portlist,
we currently limit the number of backlogged connections to 64. Since
that value was chosen in 2006, the scale at which data centres operate
has changed significantly. Given a modern server with many thousands of
clients, a limit of 64 connections can create bottlenecks, particularly
at at boot time.
By converting to using an argument of -1, we allow the backlog to be set
by the default value in /proc/sys/net/core/somaxconn.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 utils/nfsd/nfssvc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/utils/nfsd/nfssvc.c b/utils/nfsd/nfssvc.c
index 46452d972407..c781054dbdae 100644
--- a/utils/nfsd/nfssvc.c
+++ b/utils/nfsd/nfssvc.c
@@ -205,7 +205,7 @@ nfssvc_setfds(const struct addrinfo *hints, const char *node, const char *port)
 			rc = errno;
 			goto error;
 		}
-		if (addr->ai_protocol == IPPROTO_TCP && listen(sockfd, 64)) {
+		if (addr->ai_protocol == IPPROTO_TCP && listen(sockfd, -1)) {
 			xlog(L_ERROR, "unable to create listening socket: "
 				"errno %d (%m)", errno);
 			rc = errno;
-- 
2.44.0