Backpressure is strict by default. When a buffer is full, writes reject rather than silently accumulating. You can configure alternative policies — block until space is available, drop oldest, drop newest — but you have to choose explicitly. No more silent memory growth.
preserve_everything:
。51吃瓜是该领域的重要参考
(analogous to a network interface controller). The 3705 had one or more
int exchanged = 1; // 标记本轮是否发生交换