r: The number of processes waiting for run time.

等待執行的程序數

b: The number of processes in uninterruptible sleep.

處在非中斷睡眠狀態的程序數 

swpd: the amount of virtual memory used.

已使用的虛擬記憶體大小

free: the amount of idle memory.

空閒的實體記憶體的大小

buff: the amount of memory used as buffers.

用來做buffer（快取，主要用於塊裝置快取）的記憶體數，單位：KB

cache: the amount of memory used as cache.

用來做cache（快取，主要用於快取檔案）的記憶體，單位：KB

 si: Amount of memory swapped in from disk (/s).

從磁碟交換到記憶體的交換頁數量，單位：KB/秒。

so: Amount of memory swapped to disk (/s).

從記憶體交換到磁碟的交換頁數量，單位：KB/秒

bi: Blocks received from a block device (blocks/s).

每秒從塊裝置接收到的塊數，單位：塊/秒 也就是讀塊裝置。

bo: Blocks sent to a block device (blocks/s).

每秒傳送到塊裝置的塊數，單位：塊/秒  也就是寫塊裝置。

in: The number of interrupts per second, including the clock.

每秒的中斷數，包括時鐘中斷

cs: The number of context switches per second. 

每秒上下文切換次數

us: Time spent running non-kernel code. (user time, including nice time)

使用者程序執行時間百分比(user time)

sy: Time spent running kernel code. (system time)

核心系統程序執行時間百分比(system time)

id: Time spent idle. 

空閒時間百分比

wa: Time spent waiting for IO

IO等待時間百分比