Carl, I can confirm that this issue exists. We have seen the exact same performance characteristics on EC2, regardless of instance type. The same performance ch

Carl, I can confirm that this issue exists. We have seen the exact same performance characteristics on EC2, regardless of instance type. The same performance characteristics apply even if the instance is a type which would be singly-hosted on the host hardware. And in spite of days of effort, nothing I could do seemed to "tune" it out. Our most amusing result was watching a t1.micro beat the pants off a cc.4xlarge.