There was one regression going into BFS 0.403, and that was expanding the sticky flag to cache warm as well. Not only didn't it improve throughput on anything I could measure, it caused latency regressions so I've backed it out. The only other change going to 404 was fixing a couple of unused variable warnings that were reported by a commenter on this blog. So I consider this patch now stable and pretty much how it will go into 2.6.39 final when it comes out.
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