Our application timeout when load testing after upgrading to OEL 4.8

Hi,
We recently have an upgrade from OEL 4.7 to OEL 4.8. Our application is running fine on OEL 4.7, but since after upgraded to OEL 4.8, it fails pretty frequently with timeout error when doing load testing (20+ users).
Any ideas what can be the possible causes?
Please advise.
Thanks
-Mina

You're not giving much info.
If it is networking related, the first think i would check is to make sure the network interface is configured properly. For instance, if your computer's NIC is set to auto and your network port on the network switch is set to fixed, then you will drop packages at high load due to errors on the interface. Those errors cannot be seen from the switch. Set both to auto or fixed, but it needs to be set to the same. Auto is standard and should work unless you have some strange equipment. Also replace the networking cable with a new one.

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