该命令显示系统中的空闲内存、已使用的物理内存和交换内存的总量，以及内核所使用的缓冲区。
The command displays the total amount of free, used physical, and swap memory in the system, as well as the buffers used by the kernel.
现在应用程序使用了143MB的物理内存，其余的内存均被缓冲区占用；另外，系统现在使用了18 MB的交换空间。
Now applications have used 143mb of physical memory, with the rest of being used for buffers; in addition, the system now needs to make use of 18mb of swap.
此处对缓冲区大小所设置的限制是为了优化消息交换的性能。
The limitations on buffer size set here are for optimizing the performance of message exchanges.
特别是网络适配器，经常使用循环缓冲区来与处理器交换数据包。
Networking adaptors, in particular, often use circular buffers to exchange data (packets) with the processor.
您要求的缓冲区大小可能导致由于内存交换而丢失帧。您确定要分配这样大小的缓冲区吗？
The buffer size you have requested may cause frames to be dropped due to swapping. Are you sure you want to allocate a buffer of this size?
增加缓冲区大小的代价很高，因为它来自不能交换到磁碟的未分页记忆体，所以尽可能让缓冲区愈小愈好。
Increasing the size of the buffer is expensive, as it comes from non paged memory that cannot be swapped out to disk, so keep the buffer as small as possible.
增加缓冲区大小的代价很高，因为它来自不能交换到磁碟的未分页记忆体，所以尽可能让缓冲区愈小愈好。
Increasing the size of the buffer is expensive, as it comes from non paged memory that cannot be swapped out to disk, so keep the buffer as small as possible.
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