RDS-INFO(1)RDS-INFO(1)NAMErds-info - display information from the RDS kernel module
SYNOPSISrds-info [-cknrstIT]
DESCRIPTION
The utility presents various sources of information that the RDS kernel
module maintains. When run without any optional arguments will output
all the information it knows of. When options are specified then only
the information associated with those options is displayed.
The options are as follows:
OPTIONS-v Requests verbose output. When this option is given, some classes
of information will display additional data.
-c Display global counters. Each counter increments as its event
occurs. The counters may not be reset. The set of supported
counters may change over time.
CounterName
The name of the counter. These names come from the kernel and
can change depending on the capability of the kernel module.
Value
The number of times that the counter has been incremented since
the kernel module was loaded.
-k Display all the RDS sockets in the system. There will always be
one socket listed that is neither bound to nor connected to any
addresses because itself uses an unbound socket to collect
information.
BoundAddr,
The IP address and port that the socket is bound to. 0.0.0.0 0
indicates that the socket has not been bound.
ConnAddr,
The IP address and port that the socket is connected to.
0.0.0.0 0 indicates that the socket has not been connected.
SndBuf,
The number of bytes of message payload which can be queued for
sending or receiving on the socket, respectively.
Inode The number of the inode object associated with the socket. Can
be used to locate the process owning a given socket by searching
/proc/*/fd for open files referencing a socket with this inode
number.
-n Display all RDS connections. RDS connections are maintained
between nodes by transports.
LocalAddr
The IP address of this node. For connections that originate and
terminate on the same node the local address indicates which
address initiated the connection establishment.
RemoteAddr
The IP address of the remote end of the connection.
NextTX The sequence number that will be given to the next message that
is sent over the connection.
NextRX The sequence number that is expected from the next message to
arrive over the connection. Any incoming messages with sequence
numbers less than this will be dropped.
Flg Flags which indicate the state of the connection.
s
A process is currently sending a message down the con‐
nection.
c
The transport is attempting to connect to the remote
address.
C
The connection to the remote host is connected and
active.
-r, -s, -t
Display the messages in the receive, send, or retransmit queues
respectively.
LocalAddr,
The local IP address and port on this node associated with the
message. For sent messages this is the source address, for
receive messages it is the destination address.
RemoteAddr,
The remote IP address and port associated with the message. For
sent messages this is the destination address, for receive mes‐
sages it is the source address.
Seq The sequence number of the message.
Bytes The number of bytes in the message payload.
The following information sources are dependent on specific transports
which may not always be available.
-I Display the IB connections which the IB transport is using to
provide RDS connections.
LocalAddr
The local IP address of this connection.
RemoteAddr
The remote IP address of this connection.
LocalDev
The local IB Global Identifier, printed in IPv6 address syntax.
RemoteDev
The remote IB Global Identifier, printed in IPv6 address syntax.
If verbose output is requested, per-connection settings such as
the maximum number of send and receive work requests will be
displayed in addition.
-T Display the TCP sockets which the TCP transport is using to pro‐
vide RDS connections.
LocalAddr,
The local IP address and port of this socket.
RemoteAddr,
The remote IP address and port that this socket is connected to.
HdrRemain
The number of bytes that must be read off the socket to complete
the next full RDS header.
DataRemain
The number of bytes that must be read off the socket to complete
the data payload of the message which is being received.
SentNxt
The TCP sequence number of the first byte of the last message
that we sent down the connection.
ExpectedUna
The TCP sequence number of the byte past the last byte of the
last message that we sent down the connection. When we see that
the remote side has acked up to this byte then we know that the
remote side has received all our RDS messages.
SeenUna
The TCP sequence number of the byte past the last byte which has
been acked by the remote host.
October 30, 2006 RDS-INFO(1)
