A fix is available
APAR status
Closed as program error.
Error description
At MQ V8 the listener TCB does not accept new connection requests as quickly as at MQ V701 due to additional processing for CHLAUTH in ccxCheckPeerBlocked. This processing includes STORAGE OBTAIN/RELEASE requests by rsxAccessCache/rsxReleaseCache and name-server lookups (inet_ntop). This processing is causing the delay between the cciTcpListenConv exit and entry trace entries. This processing is unnecessary in the customer's environment as they have CHLAUTH set to DISABLED. . Additional keywords: performance slow
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 * * Release 0 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Inbound channels may take longer to * * connect. * **************************************************************** * RECOMMENDATION: * **************************************************************** When an inbound channel connects, additional processing is performed by the listener for the CHLAUTH function. This additional processing is performed regardless of whether the CHLAUTH function is DISABLED and ENABLED. The additional processing is unnecessary if CHLAUTH is DISABLED, and may introduce a delay for starting channels. When a sufficiently large number of channels are started at the same time, this delay may have a measurable impact on the overall time taken to start all the channels.
Problem conclusion
Where a customer has disabled CHLAUTH, the additional CHLAUTH processing performed by the listener task when an inbound channel starts is bypassed, decreasing the time taken to connect each channel. 000Y CSQXCCCX
Temporary fix
Comments
APAR Information
APAR number
PI59204
Reported component name
WMQ Z/OS 8
Reported component ID
5655W9700
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-03-16
Closed date
2016-04-11
Last modified date
2016-06-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI36923
Modules/Macros
CSQXCCCX
Fix information
Fixed component name
WMQ Z/OS 8
Fixed component ID
5655W9700
Applicable component levels
R000 PSY UI36923
UP16/05/04 P F605
Fix is available
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Document Information
Modified date:
02 June 2016