Performance regression between RHEL 5.4 and 5.5
Issue
- Customer is experiencing poor performance with an application after upgrading from Red Hat Enterprise Linux (RHEL) 5.4 with the 2.6.18-164 kernel to RHEL 5.5 with the 2.6.18-194 kernel.
- With kernel-2.6.18-164, the simulation completes with consistent times.
- However, with kernel-2.6.18-194 and kernel-2.6.18-194.3.1 updates, the simulation is inconsistent in the completion times and always takes more time than compared to the kernel-2.6.18-164 tests.
Environment
- Red Hat Enterprise Linux (RHEL) 5.4
- RHEL 5.4 server: Linux node10.example.com 2.6.18-164.el5 #1 SMP Tue Aug 18 15:51:48 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
- Red Hat Enterprise Linux (RHEL) 5.5
- RHEL 5.5 server: Linux node32.example.com 2.6.18-194.3.1.el5 #1 SMP Sun May 2 04:17:42 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
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