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I'm not sure this is a good idea.
For one thing, if you want to work on performance, there are much more dramatic changes to the protocol that could be done that would help much more. I can't believe that the cost of acks is significant compared to all the other bottlenecks.
Also, TCP is reliable delivery at the transport layer. It doesn't do reliable delivery at the application layer -- that's what the gdb remote protocol ACKs do. The fact that TCP delivered a packet to the stub doesn't mean the stub acted on it.
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