commit 0470fd526cb15ace1241f8c60fb98fedef74307b
Author: Trond Myklebust <trond.myklebust@hammerspace.com>
Date:   Fri May 10 09:09:28 2024 -0400

    nfsd: allow more than 64 backlogged connections
    
    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.
    Let's use the POSIX-sanctioned maximum value of SOMAXCONN.
    
    Reviewed-by: Jeff Layton <jlayton@kernel.org>
    Acked-by: Chuck Lever <chuck.lever@oracle.com>
    Tested-by: Chen Hanxiao <chenhx.fnst@fujitsu.com>
    Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
    Signed-off-by: Steve Dickson <steved@redhat.com>

diff --git a/utils/nfsd/nfssvc.c b/utils/nfsd/nfssvc.c
index 46452d97..9650cece 100644
--- a/utils/nfsd/nfssvc.c
+++ b/utils/nfsd/nfssvc.c
@@ -205,7 +205,8 @@ 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, SOMAXCONN)) {
 			xlog(L_ERROR, "unable to create listening socket: "
 				"errno %d (%m)", errno);
 			rc = errno;