> Date: Tue, 29 Mar 2011 22:42:47 +0200
> From: Claudio Jeker <cje...@diehard.n-r-g.com>
>
> Here is a possible fix. The problem was that because of the way NFS uses
> the socket API it did not turn of the sendbuffer scaling which reset the
> size of the socket back to 17376 bytes which is a no go when a buffer of
> more then 17k is generated by NFS. It is better to initialize the sb_wat
> in soreserve() which is called by NFS and all attach functions.
This no longer does the sbcheckreserve() dance though. Is that alright?
> Index: netinet/tcp_usrreq.c
> ===================================================================
> RCS file: /cvs/src/sys/netinet/tcp_usrreq.c,v
> retrieving revision 1.105
> diff -u -p -r1.105 tcp_usrreq.c
> --- netinet/tcp_usrreq.c 10 Oct 2010 22:02:50 -0000 1.105
> +++ netinet/tcp_usrreq.c 29 Mar 2011 20:26:55 -0000
> @@ -653,15 +653,7 @@ tcp_attach(so)
> int error;
>
> if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
> - /* if low on memory only allow smaller then default buffers */
> - if (so->so_snd.sb_wat == 0 ||
> - sbcheckreserve(so->so_snd.sb_wat, tcp_sendspace))
> - so->so_snd.sb_wat = tcp_sendspace;
> - if (so->so_rcv.sb_wat == 0 ||
> - sbcheckreserve(so->so_rcv.sb_wat, tcp_recvspace))
> - so->so_rcv.sb_wat = tcp_recvspace;
> -
> - error = soreserve(so, so->so_snd.sb_wat, so->so_rcv.sb_wat);
> + error = soreserve(so, tcp_sendspace, tcp_recvspace);
> if (error)
> return (error);
> }
> Index: kern/uipc_socket2.c
> ===================================================================
> RCS file: /cvs/src/sys/kern/uipc_socket2.c,v
> retrieving revision 1.51
> diff -u -p -r1.51 uipc_socket2.c
> --- kern/uipc_socket2.c 24 Sep 2010 02:59:45 -0000 1.51
> +++ kern/uipc_socket2.c 29 Mar 2011 20:18:46 -0000
> @@ -353,6 +353,8 @@ soreserve(struct socket *so, u_long sndc
> goto bad;
> if (sbreserve(&so->so_rcv, rcvcc))
> goto bad2;
> + so->so_snd.sb_wat = sndcc;
> + so->so_rcv.sb_wat = rcvcc;
> if (so->so_rcv.sb_lowat == 0)
> so->so_rcv.sb_lowat = 1;
> if (so->so_snd.sb_lowat == 0)
