Dxfer_len: the length of the user memory for data transfer.
dxfer_len：数据传输的用户内存的长度。
This is the purpose behind the user space memory access functions.
这就是用户空间内存访问函数的目的。
There are factors that can increase the amount of memory per virtual user.
有些因素能够增加每位虚拟用户的内存容量。
But the user must understand that disconnected objects are kept in memory.
但是用户必须理解，断开连接的对象是保存在内存中。
Thus, less memory is available for additional and future user or application growth.
这需要更多内存，因此剩余内存更少，难以支持用户或应用程序的增长。
Data contains user data (which is the agent private memory).
数据包含用户数据(即代理私有内存)。
User processes then held in high memory.
用户进程保存在内存高端。
User processes then held in high memory.
用户进程保存在内存高端。
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