Meaning of some infos from top and vmstat?

[littlebigman]

Hello

I'm having a hard time finding what some of the fields mean when
running "top" and "vmstat" on a Debian host:

====== top ===============

Cpu(s): 78.8% us, 18.7% sy, 0.0% ni, 0.7% id, 0.3% wa, 0.5% hi, 1.0%
si
Mem: 1015484k total, 993344k used, 22140k free, 76920k buffers
Swap: 514040k total, 101032k used, 413008k free, 208496k cached

=> What do wa/hi/si mean?
=> What is "cached" swap?

====== vmstat ===============

procs -----------memory---------- ---swap-- -----io---- --system--
----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us
sy id wa
 9  0      0  55588  87548 329824    0    0   166   292  369   896 69
17  5  9

=> What do bi/bo mean for "io"? Bytes in/out?
=> What do in/cs mean for "system"?

Thank you.

[infoshirish]

Hey,
These are the meanings:-

IO:
bi: Blocks received from a block device (blocks/s).
bo: Blocks sent to a block device (blocks/s).

System
in: The number of interrupts per second, including the clock.
cs: The number of context switches per second.

[littlebigman]

Thanks a lot !