在redhat 9.0中

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#vmstat 2
  procs                      memory      swap          io     system      cpu
 r  b  w   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id
 1  0  0      0 1060452 175980 189928    0    0     0    18   13     7  0  0 19
 0  0  0      0 1060452 175980 189928    0    0     0     0  106    11  0  0 100
 0  0  0      0 1060452 175980 189928    0    0     0   136  120    29  0  1 99
 0  0  0      0 1060452 175980 189928    0    0     0     0  104    12  0  0 100
^C

在CentOS 4.3中

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#vmstat 2
procs —————-memory————— —-swap— ——-io—— —system— ——cpu——
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0      0 937152  52904 890116    0    0     0     0    1     1  0  0 100  0
 0  0      0 937088  52904 890116    0    0     0     2 1026    73  0  0 100  0
 0  0      0 937088  52904 890116    0    0     0    24 1036    69  0  0 100  0
 0  0      0 937088  52904 890116    0    0     0     0 1025    63  0  0 100  0
^C

CPU这一项中，wa表示IO等待时间，在2.5.41内核以前的版本中IO-wait时间包含在id中.

下面是man vmstat的注解:

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Procs
    r: The number of processes waiting for run time.
    b: The number of processes in uninterruptible sleep.
 
Memory
    swpd: the amount of virtual memory used.
    free: the amount of idle memory.
    buff: the amount of memory used as buffers.
    cache: the amount of memory used as cache.
    inact: the amount of inactive memory. (-a option)
    active: the amount of active memory. (-a option)
 
Swap
    si: Amount of memory swapped in from disk (/s).
    so: Amount of memory swapped to disk (/s).
 
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.
 
CPU
    These are percentages of total CPU time.
    us: Time spent running non-kernel code. (user time, including nice time)
    sy: Time spent running kernel code. (system time)
    id: Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time.
    wa: Time spent waiting for IO. Prior to Linux 2.5.41, shown as zero.