I helped Andrew ran the S3 tests. For us-standard bucket, we used an m3.medium instance in the us-east region, and for us-west bucket, we used a t2.micro instance in the us-west-2 (Oregon) region.

It is also possible that S3 somehow tries to pin requests from the same client to the same storage nodes. A better test setup would coordinate writing and reading across multiple clients, but is beyond the scope of this experiment. http://www.researchgate.net/publication/259541556_Eventual_C... describes such a system and their results.