Benchmarks with trivial epoll based web server showed noticeble (more than 40%) imrovements of the request rates (1600-1800 requests per second vs. more than 2300 ones). It can be described by more cache-friendly freeing algorithm, by tighter objects packing and thus reduced cache line ping-pongs, reduced lookups into higher-layer caches and so on.
Is that an hypothesis, or did you get a chance to gather cache stats with something like http://www.hp.com/go/Caliper or the like on the platform(s) you were testing?
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