A fix is available
APAR status
Closed as program error.
Error description
AIO fast path to disk can trigger lock contention in disk layer when aio buf size is > 128K, as result one can have significant performance degradation. Typical symptom is: high cpu usage with diskinfo lock contention
Local fix
Turn off the aio fastpath
Problem summary
AIO performance/lock contention on device with greater than 128K transfer speeds.
Problem conclusion
Cache device tranfer speed for faster lookup
Temporary fix
Comments
5300-09 - use AIX APAR IZ59538 5300-10 - use AIX APAR IZ82710 5300-11 - use AIX APAR IZ82208 6100-02 - use AIX APAR IZ79540 6100-03 - use AIX APAR IZ79395 6100-04 - use AIX APAR IZ76490 6100-05 - use AIX APAR IZ78005 6100-06 - use AIX APAR IZ74245 7100-00 - use AIX APAR IZ84883
APAR Information
APAR number
IZ82208
Reported component name
AIX 5.3
Reported component ID
5765G0300
Reported release
530
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2010-08-09
Closed date
2010-08-09
Last modified date
2013-03-28
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX 5.3
Fixed component ID
5765G0300
Applicable component levels
R530 PSY U837658
UP10/09/20 I 1000
PTF to Fileset Mapping
U837658 bos.rte.aio 5.3.11.3
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11P","label":"APARs - AIX 5.3 environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"530","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
28 March 2013