High load average mail server 5.3-RELEASE
Francisco Reyes
lists at natserv.com
Thu Sep 22 18:46:48 PDT 2005
On Tue, 13 Sep 2005, mariano benedettini wrote:
>91.3% idle
CPU is not the problem. :-)
> Mem: 1599M Active, 1704M Inact, 311M Wired, 189M Cache, 112M Buf, 14M Free
> Swap: 2023M Total, 184K Used, 2023M Free
Swap is not the problem.
Do
vmstat 10
Watch the output.
In particular look at the first 3 columns.
procs
r b w
1 1 0
0 1 0
1 1 0
The left most column is CPU, the second column is disk IO.
If you have a number in the "b" column and it never hits 0 you have an I/O
problem. You HDs are not catching up.
If you are using NFS and the "b" colun is not high and hits 0 some/all the
time then the bottleneck is either the nfs connection or the nfs server.
For example I have some servers that the "b" column would be between 20
and 60 for a while. I am currently working on removing some of the load of
the machine. In my case more memory would help, but the computer vendor we
bought the machine from has sent us the wrong memory 3 TIMES!!
More information about the freebsd-performance
mailing list