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The T3 chip is supposed to be great in multi-threaded environments. However, if you take a single threaded application and put it here, you're going to see performance impacts. If your load is high, highly recommend moving to a M-series box instead of the CMT chips.
However, if you're able to give it adequate number of cores (using LDOMs or zones), you may be able to mitigate the impact. Your CPU utilization may be higher, but the app will work.
How did you get on with this? Have you looked at the T4 based servers since posting?
Initial testing seems to indicate that there should be no adverse hit to performance and we are using LDOMs to provide some more control over the instances.
I looked into the T4 series but the project was too far down the line to change direction.