Many thanks to Scott Lambert for what I believe to be the solution to my
load problem. It was nsswitch.conf which still had all its default
settings when I began this troubleshooting. I had changed all the
entries from nis to files when he mentioned it a few days ago. But he
then suggested changing the compat setting for group and passwd to files
also.
So it now looks like:
group: files
group_files: nis
hosts: files dns
networks: files
passwd: compat
passwd_files: nis
shells: files
services: files
services_files: nis
protocols: files
rpc: files
Here is the load testing result from before the change:
[root] time /usr/local/bin/smtp-source -s 10 -l 10120 -m 500 -c -f
t...@bluemarble.net -t dbro...@bluemarble.net localhost:25
500
real 0m58.122s
user 0m0.029s
sys 0m0.135s
And after:
[root] time /usr/local/bin/smtp-source -s 10 -l 10120 -m 500 -c -f
t...@bluemarble.net -t dbro...@bluemarble.net localhost:25
500
real 0m0.358s
user 0m0.063s
sys 0m0.135s
Can't wait to see how it handles under a real mail load once I can
schedule the migration from the current server. Thanks again for all
the help.
Dave Brodin
On 12/16/2010 10:46 AM, Wietse Venema wrote:
Wietse Venema:
Victor Duchovni:
On Wed, Dec 15, 2010 at 01:37:48PM -0500, Dave Brodin wrote:
I ran the following command:
time /usr/local/bin/smtp-source -s 10 -l 10120 -m 500 -c \
-f t...@bluemarble.net -t dbro...@bluemarble.net localhost:25
OK, this is smtp-source with 10 (modest) parallel sessions,
10KB (modest) messages, total 500 messages. This should typically
accept mail at 100+ messages a second finishing in under 5 seconds.
And got the following output at the end:
real 0m58.261s
user 0m0.055s
sys 0m0.126s
For what it's worth, here is one data point for Postfix 2.8-20101210
on FreeBSD 8.2-Beta1 i386 with 2 CPUs running as a VirtualBox guest,
with the smtp-source program in the VirtualBox guest. This delivers
mail to /dev/null, and ps(1) shows 10 smtpd processes. The top(1)
output spikes briefly.
/usr/bin/time ./smtp-source -t dev-n...@localhost -s 10 -l 10120 -m 500 -c
168.100.189.20:25
500
3.29 real 0.00 user 0.11 sys
I don't have a lot of hardware lying around for bare metal testing
but I can do a temporary install on a 64-bit 2-CPU laptop computer.
Second data point: the test takes a similar amount of time on a
bare metal machine (Postfix 2.8-20101210, FreeBSD 8.2-Beta1 amd64,
Core 2 Duo CPU). Both Postfix and FreeBSD were installed "out of
the box" without any additional kernel tuning or Postfix tuning.
I may be able to do some quad-core tests in a week or so, but I
would be surprised if the result will radically change.
Wietse
--
Dave Brodin
Network Operations Manager
Smithville Digital
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