Explanation of the content of FreeBSD vmstat results

Top is designed for Linux. The free concept in the FreeBSD VM is quite different from the other OS, and using the top to view RAM memory is meaningless for FreeBSD. The correct way is to look at the Vmstat.

Procs memory page disk faults CPU

R B W swap free re mf mi po fr de SR f0 s0 S1 S2 in SY CS US sy ID

0 0 0 14888 19120 0 4 2 11 10 0 0 0 0 0 8 198 2158 98 11 19-69

The unit of swap should be k, not M. There are two more important parameters are pi, PO, indicating the memory of the transfer, pull out the page, Unit is k, but the value as a measure, I am not clear, do not know whether there is experience value.

Also, it is best to use the Vmstat t [n] command, such as Vmstat 5 5, to represent an n (5) Secondary sample in T (5) seconds. If you only use Vmstat to reflect the real system situation, try it and see the results.

Procs:

r--> number of processes waiting in the run queue

B--> the number of processes waiting for IO

W--> can enter a process that runs the queue but is replaced

Memoy

Swap--> currently available swap memory (k)

free--> free memory (k)

Pages

re--"Recycled pages

mf--"Not a serious error page

pi--"Number of pages entered (k)

po--the number of pages (k)

fr--Number of free pages (k)

de--the number of misses in the page read in advance

sr--pages scanned by the clock algorithm

Disk operation is displayed per second. s for SCSI disk, 0 for disk number

Fault shows the number of interrupts per second

in--"Equipment interrupted

sy--"System interrupted

cy--"CPU Switching

CPU indicates the CPU usage state

cs--the time used by the user process

sy--the time used by the system process

id--"CPU Idle Time

Explain:

If R is often greater than 4 and the ID is often less than 40, the CPU load is heavy.

If the Pi,po is not equal to 0 for a long time, it indicates insufficient memory.

If disk is often not equal to 0, and the queue in B is greater than 3, the IO performance is not good.