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TCP/IP send getting slower

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Old 05-22-2003
TCP/IP send getting slower
Hi,
We have developed a server program using TCP/IP Communication to communicate with another client program. After running for some days we find the TCP/IP connection from the server program is getting slower ie, the messages are not send quickly to the client.

What i mean to say is since the tcp/ip send() function in the server program is in the blocked mode, we suspect the reason for the slowness in sending the message to the client program could be because of the TCP buffer (in the server)getting full and the clients failure to pull the messages from the buffer in time.All these has being coded in a posix thread. Once the buffer is full, the send() function is blocked until the client pulls some messages from the buffer, the send() doesn't return.

We have been perplexed by this problem for quite a long time. we intially though it could be the network problem..but the network is 100Mbs..

The hardware used is sun solaris machine..

I will be very grateful if some one can advice us in finding a solution for this problem.
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LEARN ABOUT ULTRIX

tcp-env

tcp-env(1)                                                    General Commands Manual                                                   tcp-env(1)

NAME

       tcp-env - set up TCP-related environment variables

SYNOPSIS

       tcp-env [ -rR ] [ -ttimeout ] program [ arg ...  ]

DESCRIPTION

       The  input  for  tcp-env  must be a TCP connection.  tcp-env finds out information about that connection, puts the information into several
       environment variables as described in tcp-environ(5), and runs program with the given arguments.

       Usually tcp-env is run from inetd.  It might instead be run from another server that already sets up the right  environment  variables;  if
       PROTO  is  set  to  TCP  when  tcp-env  is invoked, tcp-env assumes that all the other variables are set up properly, and it does not check
       whether the input is a TCP connection.

OPTIONS

       -r     (Default.)  Attempt to obtain TCPREMOTEINFO from the remote host.

       -R     Do not attempt to obtain TCPREMOTEINFO from the remote host.

       -ttimeout
              Give up on the TCPREMOTEINFO connection attempt after timeout seconds.  Default: 30.

SEE ALSO

       tcp-environ(5), inetd(8)

                                                                                                                                        tcp-env(1)