On Mon, 30 Jul 2012 23:16:23 +0000 "Myklebust, Trond"
<Trond.Myklebust@xxxxxxxxxx> wrote:
> Hi Neil,
>
> Could you please add the missing s-o-b?
>
> Cheers
> Trond
Here 'tis. Thanks.
NeilBrown
From: NeilBrown <neilb@xxxxxxx>
Date: Tue, 31 Jul 2012 14:33:39 +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 <neilb@xxxxxxx>
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 23ff18f..9cb1215 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -265,6 +265,10 @@ 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) {
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