Performance Regression in OL6 Guest vServers compared to OL5 Guest vServers on Exalogic (Doc ID 1980462.1)

Last updated on MAY 19, 2015

Applies to:

Oracle Exalogic Elastic Cloud Software - Version 2.0.6.0.2 and later
Linux x86-64
Oracle Exalogic Elastic Cloud Software - Version 2.0.6.1.2 and later
Exalogic Guest vServers running Oracle Linux 6.x

Symptoms

Significant performance regression is observed in various benchmarking tests executed on an OL6 Guest vServer compared to the same tests on an OL5 Guest vServer on Exalogic. For example, in an in-house performance test that emulates a shopping cart style web application against WebLogic server running within an OL6 Guest vServer on Exalogic connected to Exadata, a performance degradation of 5x to 9x has been observed in a key metric (90% Response Time measurement).

These results are indicative of a general regression that may be encountered under high load in an OL6 Guest vServer on Exalogic. 

Changes

The OL6 Guest vServer on Exalogic includes UEK2 kernel 2.6.39-400.214.5.1.el6uek.x86_64, which is an upgraded and newer version of the UEK1 kernel 2.6.32-400.26.3.el5uek.x86_64 included in the OL5 Guest vServer. 

Cause

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