After increasing the RAM in Database CPU 80% used.

HI,
We are currently running EBS 12.0.6 ith database 10.2.0.3 multi node env (this is production)
After increasing the RAM in application from 8 to 16 GB and in database from 16 to 24 GB, I start the database and my database running normal but when I starts the application services then CPU Utilization goes upto 70% to 80%, and my all users are seriously facing very bad recponse.
I have no idea what is happning in our system, but when I revert back the RAM's to 8 GB in application and 16 GB in database my application and Database working normal.
Please assist me???????????
Our system specifications are following:
=============
Current envoirnment:
=============
Application Machine:
--> Dell 2950, 8 GB RAM, OS Linux AS 4.6 (32-bit).
--> CPU's:
[oracle@apps ~]$ cat /proc/cpuinfo |grep MHz
cpu MHz : 2992.572
cpu MHz : 2992.572
cpu MHz : 2992.572
cpu MHz : 2992.572
cpu MHz : 2992.572
cpu MHz : 2992.572
cpu MHz : 2992.572
cpu MHz : 2992.572
--> Linux apps.silhon.com 2.6.9-67.ELsmp #1 SMP Wed Nov 7 13:58:04 EST 2007 i686 i686 i386 GNU/Linux.
Database Machine:
--> Dell R900, 16 GB RAM, OS Linux AS 4.6 (32-bit).
--> CPU's:
[oracle@appsdb dontdelete]$ cat /proc/cpuinfo |grep MHz
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
cpu MHz : 2926.039
--> Linux appsdb.silhon.com 2.6.9-67.ELsmp #1 SMP Wed Nov 7 13:58:04 EST 2007 i686 i686 i386 GNU/Linux.
========================================================================
==================
New changed envoirnment:
==================
We just increase the RAM as:
---> Application 8 GB to 16 GB.
---> Database 16 GB to 24 GB.
Thanks.

HI,
I have checked the kernel-hugemem as:
# rpm -qa | grep kernel
kernel-smp-2.6.9-67.EL
kernel-hugemem-devel-2.6.9-67.EL
kernel-devel-2.6.9-67.EL
kernel-doc-2.6.9-67.EL
kernel-utils-2.4-13.1.105
kernel-smp-devel-2.6.9-67.EL
kernel-xenU-devel-2.6.9-67.EL
kernel-2.6.9-67.EL
What is the meaning of above output, I mean have already kernel-hugemem rmp installed?
If yes then why the system not using it.
When I had install 24 GB RAM, my OS detect it and also show the RAM 24 GB (checked by free command), but my Database was having high CPU after increasing RAM 24 upto 24 GB.
So, Should I install this rpm "kernel-hugemem-2.6.9-67.EL.i686.rpm"?????
Regards
Edited by: user12007410 on Feb 18, 2011 8:14 PM

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