NAME
rds-info - display information from the RDS kernel module
SYNOPSIS
rds-info [-v] [-cknrstIT]
DESCRIPTION
The rds-info utility presents various sources of information that the RDS
kernel module maintains. When run without any optional arguments
rds-info 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:
-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 rds-info itself uses an unbound socket to
collect information.
BoundAddr, BPort
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, CPort
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, RcvBuf
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 connection.
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, LPort
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, RPort
The remote IP address and port associated with the message. For
sent messages this is the destination address, for receive
messages 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
provide RDS connections.
LocalAddr, LPort
The local IP address and port of this socket.
RemoteAddr, RPort
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.