I want to persuade my boss to migrate our mailsystems to exim.
I tried to stress test my mailserver running 4.12.
The hardware is a dual P3 XEON700 with 1 GB of RAM
RAID1 message spool and separate RAID1 system/log partition on 10Krpm
scsi disks.
This hardware should normally be able to cope with some load.
The current setup is pretty straightforward:
standard rcpt acl
smtp_accept_max set to 200
split queue
However when I start putting more than approx 70 simultaneous smtp
sessions against the box the load starts killing my machine ranging up
to loads of 200 and 100% CPU usage.
It seems that it`s not capable of handling all the deliveries.
I tried running queue only with a few queue runners.
Mail took longer to get out but load levels were acceptable.
Do you have any sugestions how to set up a box so that it would be able
to process around 120K messages per hour (15Kb-30Kb).
We are not doing anything special like filtering, callouts, no rbl
(yet), just basic relay host and domain control.
