Yes, TCP provides the guarantee that your application will always receive data in the same order it was sent. Your kernel will do the necessary buffering and pa

Yes, TCP provides the guarantee that your application will always receive data in the same order it was sent. Your kernel will do the necessary buffering and packet reordering to provide that guarantee. So SACK might reduce packet resends, but it doesn’t prevent the latency hit that comes for having to waiting for the data went missing. Even if your application is capable of either handling out-of-order data, or is simply capable of handling missing data.