On 14/11/2002 13:51, Tzafrir Cohen wrote:
On Thu, 14 Nov 2002, Sagi Bashari wrote:
Hi,
I just setuped a new server. It is only running postfix at this time,
relaying mail from another server.
The distribution is RedHat 7.3 with all of the updates.
There is a large amount of mail in the queue (about 17k mails).
The load average goes upto 8.x. If I kill postfix, it goes back down to
0.x. The strange thing is that top shows that the cpu usage is pretty low:
CPU0 states:1.2% user, 3.2% system, 0.4% nice, 95.1% idle
CPU1 states:1.4% user, 2.3% system, 0.4% nice, 95.3% idle
Looks like the machine is over-swapping.
Actually, it's not swapping at all:
[sagi@black sagi]$ free -m
total used free shared buffers cached
Mem: 1006 991 14 0 151 547
-/+ buffers/cache: 293 712
Swap: 1992 0 1992
[sagi@black sagi]$
Hardware is not the problem. The machine is a dual Athlon MP 2000 with
1GB of DDRAM and 2 IDE hdds with 8MB cache in RAID1. It should be able
to handle that kind of work without any problem.
I'm using ext3.
Any ideas/suggestions?
Maybe limit the number of postfix processes (of some kind?)
No, it's not that: [sagi@black sagi]$ ps auxww|grep -ic postfix 77 [sagi@black sagi]$
After looking in the postfix users archive, I suspect that it is a filesystem issue. I ran 'chattr -R -S +A' on the queue spool dir like someone suggested there (to disable atime/sync updates). It did reduce the load a bit, but it is still too high.
Use postfix's various concurrecy limitations.
Have a look at http://postfix.openu.ac.il/rate.html
Sagi
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