CPU load higher after applying in 147440 kernel on Oracle database servers

Hi all,
Just wanted to know if anyone else is seeing an Increased CPU load with higher peaks and for longer periods of time, especially on single thread processes on oracle database servers. Our Oracle Database versions vary from Oracle 10 to Oracle 11.1.0.7 11.2.0.2 10.2.0.4. The Hardware includes Sunfire V245's, V440 and T5240. We saw a slight performance hit when going to 147440-02 at the first of Oct, but no big deal. Then we applied 147440-04 in the first part of Nov. And of course we got CPU panics and Zfs file system stopped mounting basically a complete disaster. Oracle provided and IDR for the CPU panic and then later release 147440-06. Which resolved the CPU panics and zfs file system mounts. But now our load average on is 1 to 3 points higher during load, grid control is constantly complaining of 100% utilization. I have had a call open since the first of November with oracle/sun support and have provided guds performance stats on before and after Kernel change. They are still saying that its not an issue. It is so bad we had to roll back to a July kernel on one of the servers.

Just to let you all know what we have found. After 2 1/2 months of working with Oracle Kernel team, they have identified the Oracle Enterprise Manager (emagent) (Grid control Agent) was using nearly 60000 threads under the 147440 Kernel and only 1500 threads under an older kernel.
I googled the solution for the emagent, but I continue to press Oracle Kernel Engineers to work with their software division, to identify other products that might cause similar problems.
http://oracle-dba-quickanswers.blogspot.com/2011/10/emagent-consuming-very-high-cpu.html

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>
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>
but at the same time some people claim that after reboot their database performance is better than their normal performance for some days. it seems controversial that's why i am posting it here.
what might be the reason behind this?? prior can have a valid reason of hard parsing, but what with second case??
>
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CPU load higher after applying in 147440 kernel on Oracle database servers

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