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syndrome avoidance. The combination of SWS avoidance and ack-every-other causes low throughput if the block size divided by the MSS is odd (which is true with the default block size and MSS). Turning on TCP_NODELAY disables the Nagle algorithm and sender SWS avoidance. The rdump request/response protocol can not invoke Nagle and cannot cause SWS, so this has no negative effects.