IST2273E

Explanation
 This unsolicited message is issued when a storage
block address list (SBAL) is discarded as the result of congestion
on the inbound data staging queue. An SBAL is a  read buffer that
can contain up to 64 KB of TCP/IP packets.  SBALs are discarded to
protect against the overuse of system resources, specifically ECSA
storage. This message might mean that there is a TCP/IP stack contention
or dispatching  problem. 
 This message remains on the screen
until congestion is alleviated or until the message is manually deleted.

 In the message text:  jobname
The 1–8 character TCP/IP job name used to start the TCP/IP
address  space.

System action
 If congestion subsides for at least 30 seconds,
this message is automatically deleted. If congestion persists, message
IST2273E is deleted and re-issued every 5  minutes.

Operator response
 You can use the DISPLAY NET,TRL and DISPLAY
NET,TRL,TRLE=trlename commands to determine which
interfaces or devices are experiencing congestion. Message IST2305I
provides the number of SBALs that are discarded. These interfaces
or devices can be stopped or recycled in an attempt to eliminate the
congestion.

System programmer response
 If the condition is persistent, take
the following actions:  
 Study and possibly adjust the TCP/IP dispatching priority 
If the condition continues to persist:  If you have access to IBMLink, search for known problems in this
area. If no applicable  matches are found,  take a dump of the TCP/IP
address space and the VTAM® 
address space and report the problem to IBM® using
the  Electronic Technical  Report (ETR) option on IBMLink.  
If you do not have access to IBMLink, take a dump of the TCP/IP address
space  and the VTAM address
space and report the problem to the IBM software
support  center.

User response
 Not applicable.

Problem determination
 Not applicable.

Source
 z/OS® Communications
Server SNA

Module
 You can display the module that issues a SNA message
in the message by setting the MSGMOD start option to YES.  See Adding the originating module to the message text for more information about the MSGMOD
start option.

Routing code
 2

Descriptor code
 11

Automation
 Automation is recommended because persistent discarding
of inbound data can have a significant impact on latency and throughput.

Example
  IST2273E PACKETS DISCARDED FOR TCPCS - READ QUEUE CONGESTION