Things you notice looking at tcpdumps: DynamoDB sends a TCP ACK for the segment containing a request, then sends its response a few ms later. It sure would be nice if there were a configuration option which allowed them to save bandwidth (+CPU time) by delaying that ACK.
freeing memory has a CPU cost too, and it can be non-linear with ugly peaks. Getting that out of the way while nothing else is happening might increase overall performance.
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Maybe... given the size of socket buffers we're talking about here, I'd be astonished if you could find a context where it mattered though.
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