MMP Performance Issue After Upgrading to 8.0.2.0/8.0.2.1 with Single CPU Server

(Doc ID 2358403.1)

Last updated on FEBRUARY 12, 2018

Applies to:

Oracle Communications Messaging Server - Version 8.0.2 and later
Information in this document applies to any platform.

Symptoms

We are in the process of upgrading from Messaging Server 7.0.5 to 8.0.2 and are seeing a significant performance reduction on our test 8.0.2 MMP system.

We suspect the issue has something to do with threading on a single CPU and messaging server 8.0.2.x on Linux driving this behavior.

After changing these options, we do observe improved pop3 performance:

Interestingly, when running vmstat the "r" column under "kthr" would never go above 1 when running in epoll() mode. Now with poll() the number can be >1. This also serves to illustrate a race condition or bottleneck in epoll() implementation.

Cause

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