From b042414feb240df5f5911b9bca39b61e6738e814 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Tue, 31 Jul 2012 14:40:12 +1000 Subject: [PATCH] nfs: increase number of permitted callback connections. By default a sunrpc service is limited to (N+3)*20 connections where N is the number of threads. This is 80 when N==1. If this number is exceeded a warning is printed suggesting that the number of threads be increased. However with services which run a single thread, this is impossible. For such services there is a ->sv_maxconn setting that can be used to forcibly increase the limit, and silence the message. This is used by lockd. The nfs client uses a sunrpc service to handle callbacks and it too is single-threaded, so to avoid the useless messages, and to allow a reasonable number of concurrent connections, we need to set ->sv_maxconn. 1024 seems like a good number. Signed-off-by: NeilBrown Signed-off-by: Trond Myklebust --- fs/nfs/callback.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c index ca3ac992028b..4c8459e5bdee 100644 --- a/fs/nfs/callback.c +++ b/fs/nfs/callback.c @@ -241,6 +241,10 @@ int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt) ret = -ENOMEM; goto out_err; } + /* As there is only one thread we need to over-ride the + * default maximum of 80 connections + */ + serv->sv_maxconn = 1024; ret = svc_bind(serv, net); if (ret < 0) { -- 2.34.1