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Full Discussion: Truss output interpretation
Top Forums UNIX for Advanced & Expert Users Truss output interpretation Post 302921546 by ghostdog74 on Saturday 18th of October 2014 07:05:04 AM
Old 10-18-2014
Quote:
Originally Posted by Don Cragun
OK. So you're sending a request to a server on a socket and immediately after sending the request, you try to read a response from the server with NDELAY set in the socket options. There is no server and no network that can respond that fast to a request.

There are a couple of obvious things you could try:
  1. Drop the TCP_NDELAY socket option so the read() will wait for data instead of returning immediately if no data is present.
  2. Drop the 1st read() and start with the poll() or pollsys() to wait for data to be present before attempting the read().
I haven't tried to evaluate the arguments to pollsys() to see if your program is waiting for data on a group of file descriptors or just waiting for data on fd #4. If it is just waiting for data on fd #4, I would start by trying #1; but if your program can continue processing if data is available on another file descriptor as well, choose option 2.

With what you have shown us there is no way for us to guess why it is taking more than 24 seconds for the server to respond to your request.

hi, thanks for reply
I have setup my own client and server on two test Solaris VMs, and my client app is able to connect to server and process data just fine. The difference is that, the test network has only one routing path and there are no intermediate routers/firewalls etc in between my client and server.

However, at my workplace, the environment is different. my production client and server VMs have multiple interfaces and so have many different routes. I am beginning to suspect it could be routing mis configuration that result in non optimal routes, or intermediate firewalls/switches causing the delay. So far, all i could think of is comparing the tcp and ip settings ( using ndd ) to that of production and see what can be fine tuned.

The client and server apps are proprietary, so I have no way to change any code.
thanks
 

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LEARN ABOUT HPUX

dhcpv6client_ui

dhcpv6client_ui(1)					      General Commands Manual						dhcpv6client_ui(1)

NAME

       dhcpv6client_ui - DHCPv6 client interface for requesting configuration parameters from the DHCPv6 server

SYNOPSIS

       interface_name

       interface_name config_options]
	      vendor_specific_options]

       list_of_addresses

DESCRIPTION

       is  the	interface  through  which  a user contacts the client daemon, to obtain IPv6 addresses and other configuration parameters from the
       server.	The default configuration parameters are specified as command line options when the DHCPv6 client daemon is invoked.

       When requests for IPv6 addresses or other configuration parameters, the client daemon obtains them from the server and stores in the file.

       is executed on the same machine on which the client daemon is configured.  Ensure that the client daemon is up and running before  is  exe-
       cuted.

   Options
       supports the following options:

       Request the client daemon to obtain IPv6 addresses
			     for the named interface, interface_name, from the DHCPv6 server daemon if the option is not specified.

       Specify the other configuration parameters that
			     the client daemon must request from the server daemon.

			     This option must be used in conjunction with the option.

			     The configuration parameters that the client can request are listed below:
			     Obtain one or more DNS server addresses

			     Obtain the DNS domain list

			     Obtain one or more SIP server addresses

			     Obtain the SIP domain list

			     Obtain one or more NIS server addresses

			     Obtain the NIS domain name

			     Obtain one or more NIS+ server addresses

			     Obtain the NIS+ domain name

			     Obtain all the above listed parameters

			     Obtain all the default parameters configured in the dhcpv6 client daemon

       Specify the vendor-specific options that
			     the client daemon must request from the server daemon.

			     This option must be used in conjunction with the option.

       Release the specified IPv6 addresses.

       Get the temporary addresses from the dhcpv6 client daemon.

       Print the version information of the client daemon.

       Request only the other configuration parameters. Do not
			     request IPv6 addresses.

       Notify the client daemon to utilize the IPv6 addresses
			     already obtained for an interface instead of requesting new IPv6 addresses from the server.

			     This option must be used in conjunction with the option.

       Get both temporary and non-temporary addresses from the client daemon.

       When there is no or option specified obtains only non-temporary addresses.

RETURN VALUES

       returns 0 on success and 1 on failure.

EXAMPLES

       obtains IPv6 address for the interface:

       obtains IPv6 address for the interface and additional configuration parameters:

       obtains only the DNS parameters for the interface:

AUTHOR

       was developed by Hewlett-Packard.

FILES

       All the data obtained from the server daemon is saved to this file.

SEE ALSO

       dhcpv6clientd(1M), dhcpv6db2conf(1M), dhcpv6d(1M).

																dhcpv6client_ui(1)
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