The answer is: Because the address space is limited, a large buffer pool may not fit into the address space!
答案是：因为地址空间受到限制，地址空间可能容不下一个更大的缓冲池！
Given IPv4's dwindling address pool, that obviously wouldn't be a good thing.
由于IPv4的地址池日渐枯竭，这显然不是什么好事情。
When the IPv4 address pool was created in the 1980s, it was thought that the more than 4.2 billion unique addresses possible under the system would be enough.
上世纪八十年代创建出IP地址池的时候，系统超过42亿的地址曾被认为是足够的了。
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