ISTH013E
T1BUF/T2BUF buffer pool allocation might not be optimal for use with Enterprise Extender

Explanation

Check CSVTAM_T1BUF_T2BUF_EE determined that Enterprise Extender (EE) is being used (or is intended to be used) on this system and the T1BUF or T2BUF (or both) buffer pool allocation is at its default value.

The default value might not be optimal for your system when using EE. Such a value assigned to this pool might cause performance degradation as a result of excessive buffer pool expansions and contractions. The default value for the T1BUF buffer pool is 16. The default value for the T2BUF buffer pool is 8.

Message ISTH012I is issued prior to this message for each buffer pool (T1BUF, T2BUF, or both) that has failed this check.

System action

The system continues processing.

Operator response

Contact the system programmer.

System programmer response

IBM® suggests that the T1BUF and T2BUF buffer pools be monitored and tuned to minimize the number of expansions. Minimizing buffer pool expansions will decrease internal buffer overhead processing which should increase throughput while reducing CPU consumption. These buffer pools can be monitored using the D NET,BFRUSE,BUF=(T1,T2) command. Once the appropriate allocation values for the T1BUF and T2BUF buffer pools have been determined, you can change the T1BUF and T2BUF Start option allocation values before next starting VTAM®. See the buffer pool information in z/OS Communications Server: SNA Resource Definition Reference for more information about the T1BUF and T2BUF Start Options. See the Display BFRUSE command information in z/OS Communications Server: SNA Operation for more information on the D NET,BFRUSE command.

User response

Not applicable.

Problem determination

Not applicable.

Source

z/OS® Communications Server

Module

ISTHCCK1

Routing code

Not applicable.

Descriptor code

12

Example

Not applicable.