drbd: need to set socket bufsize early to take effect
quoting tcp(7):
On individual connections, the socket buffer size must be set prior to the
listen(2) or connect(2) calls in order to have it take effect.
This adds a wrapper to do so, and uses it appropriately.
Improves performance in certain situations.
Note that because we cannot easily determine which socket will be
"meta" and wich "data" (bulk) socket, we adjust both sockets.
Previously, DRBD only adjusted the bufsizes of the "data" socket.
Thanks again to Eduard.Guzovsky@stratus.com.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index a56340d..f9a3e19 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -571,6 +571,25 @@
return rv;
}
+/* quoting tcp(7):
+ * On individual connections, the socket buffer size must be set prior to the
+ * listen(2) or connect(2) calls in order to have it take effect.
+ * This is our wrapper to do so.
+ */
+static void drbd_setbufsize(struct socket *sock, unsigned int snd,
+ unsigned int rcv)
+{
+ /* open coded SO_SNDBUF, SO_RCVBUF */
+ if (snd) {
+ sock->sk->sk_sndbuf = snd;
+ sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
+ }
+ if (rcv) {
+ sock->sk->sk_rcvbuf = rcv;
+ sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
+ }
+}
+
static struct socket *drbd_try_connect(struct drbd_conf *mdev)
{
const char *what;
@@ -592,6 +611,8 @@
sock->sk->sk_rcvtimeo =
sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ;
+ drbd_setbufsize(sock, mdev->net_conf->sndbuf_size,
+ mdev->net_conf->rcvbuf_size);
/* explicitly bind to the configured IP as source IP
* for the outgoing connections.
@@ -670,6 +691,8 @@
s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */
s_listen->sk->sk_rcvtimeo = timeo;
s_listen->sk->sk_sndtimeo = timeo;
+ drbd_setbufsize(s_listen, mdev->net_conf->sndbuf_size,
+ mdev->net_conf->rcvbuf_size);
what = "bind before listen";
err = s_listen->ops->bind(s_listen,
@@ -856,16 +879,6 @@
sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK;
msock->sk->sk_priority = TC_PRIO_INTERACTIVE;
- if (mdev->net_conf->sndbuf_size) {
- sock->sk->sk_sndbuf = mdev->net_conf->sndbuf_size;
- sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
- }
-
- if (mdev->net_conf->rcvbuf_size) {
- sock->sk->sk_rcvbuf = mdev->net_conf->rcvbuf_size;
- sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
- }
-
/* NOT YET ...
* sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
* sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
