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drbd: trigger tcp_push_pending_frames() for PING and PING_ACK

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This should reduce latency for such in-DRBD-protocol "pings",
and may help reduce spurious disconnect/reconnect cycles due to
 "PingAck did not arrive in time."

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2014-02-05 06:13:53 +01:00 committed by Philipp Reisner
parent 66ce6dbce2
commit 123ff122ad
1 changed files with 5 additions and 0 deletions
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5
drivers/block/drbd/drbd_main.c
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@ -662,6 +662,11 @@ static int __send_command(struct drbd_connection *connection, int vnr,
msg_flags);
if (data && !err)
err = drbd_send_all(connection, sock->socket, data, size, 0);
/* DRBD protocol "pings" are latency critical.
* This is supposed to trigger tcp_push_pending_frames() */
if (!err && (cmd == P_PING || cmd == P_PING_ACK))
drbd_tcp_nodelay(sock->socket);
return err;
}