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Full Discussion: AIX 6.1 reach the threshold of stream(no -a|grep strthresh)
Operating Systems AIX AIX 6.1 reach the threshold of stream(no -a|grep strthresh) Post 302770762 by MichaelFelt on Monday 18th of February 2013 08:24:48 AM
Old 02-18-2013
A rather simple way to monitor socket activity (aka streams), especially for blockage is to look at netstat -tn output.

Code:
michael@x054:[/home/michael]netstat -tn | head -2; netstat -tn | grep ESTABLISHED | head
Active Internet connections
Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)
tcp4       0     48  192.168.129.54.22      192.168.129.20.1348    ESTABLISHED

What you are looking for is numbers in the Send-Q and/or Recv-Q. If they are consistently at the sendspace/recvspace size then you may be suffering from network congestion outside the box - as TCP is doing what it can, then stopping and waiting for acknowledgements (Send-Q at max) and the "outside" is waiting for the server to wake up and respond when the Revc-Q is "stuck" at max.

I have looked at netstat -nm again. It is normal that there are some "delayed" numbers. Not sure why - probably has something to do with setting up the stack. What you want to watch for is "failed" - as that indicates, mainly, not enough memory for communications.

Question: as this sometimes occurs: are you using large sends (e.g., MTU of 9000) while the network and/or endpoints cannot support that?

What does netstat -p tcp report?
 

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LEARN ABOUT SUNOS

inet_type

inet_type(4)							   File Formats 						      inet_type(4)

NAME

       inet_type - default Internet protocol type

SYNOPSIS

       /etc/default/inet_type

DESCRIPTION

       The inet_type file defines the default IP protocol to use. Currently this file is only used by the ifconfig(1M) and netstat(1M) commands.

       The  inet_type  file  can  contain  a  number of <variable>=<value> lines. Currently, the only variable defined is DEFAULT_IP, which can be
       assigned a value of IP_VERSION4, IP_VERSION6, or BOTH.

       The output displayed by the ifconfig and netstat commands can be controlled by the value of DEFAULT_IP set in inet_type file.  By  default,
       both commands display the IPv4 and IPv6 information available on the system. The user can choose to suppress display of IPv6 information by
       setting the value of DEFAULT_IP.  The following shows the possible values for DEFAULT_IP and the resulting ifconfig and netstat output that
       will be displayed:

       IP_VERSION4     Displays only IPv4 related information. The output displayed is backward compatible with older versions of the ifconfig(1M)
		       and netstat(1M) commands.

       IP_VERSION6     Displays both IPv4 and IPv6 related information for ifconfig and netstat.

       BOTH	       Displays both IPv4 and IPv6 related information for ifconfig and netstat.

       The command-line options to the ifconfig and netstat commands override the effect of DEFAULT_IP as set in the inet_type file. For  example,
       even if the value of DEFAULT_IP is IP_VERSION4, the command

       example% ifconfig -a6

       will display all IPv6 interfaces.

EXAMPLES

       Example 1: Suppressing IPv6 Related Output

       This is what the inet_type file must contain if you want to suppress IPv6 related output:

       DEFAULT_IP=IP_VERSION4

SEE ALSO

       ifconfig(1M), netstat(1M)

SunOS 5.10							    16 Jun 1999 						      inet_type(4)
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