Performance of mailserevr in FreeBSD 5.4
schultz at sgi.com
Fri Sep 23 09:56:41 PDT 2005
On Tue, 20 Sep 2005, Deepak Naidu spaketh thusly:
-} It would be good, if I have some data of posted doc regarding this... or of
-}your own experience. Thanx for your advise ....
Ok. I'm posting this to advocacy as well in case any find it useful or
at least interesting.
Here's a summation of the testing I did and the results of those tests.
As we were only looking for a few things this is far from a scientific
analysis so FWIW.
I wanted to test various configs to see what gave the best throughput in
a relay configuration for our real-time requirements, i.e. ave # of
recipients, ave size of each email, etc.
- OS's: FreeBSD 5.4 with and w/o softupdates, Fedora Core 3, Fedora Core 4.
The FC installations used ext3 for the filesystems. I wanted to try
with Reiser but ran out of time.
- Sink systems simply threw everything to /dev/null. We had multiple sink
systems to ensure they were never a chokepoint.
- Source systems used fbsd's postal package as:
postal -m 11 -p 4 -c 2 d3 usernames -
where usernames contained 2 and 3 usernames. No significant
difference was found using 2 or 3 usernames.
- Test relay was a dual-proc 800 MHz system PC with 1 GB RAM and the
entire system on 1 5400 RPM drive. (I know - nobody would ever run
a mail server with /var/spool on the root drive but we were really
just looking for difference percentages, not max throughput and had
some old systems lying around... ;)
- All installs were default installs. I thought about tweaking this or
that, e.g. postfix has some notes on things to do for high-volume
installations that we didn't do. I wanted out-of-the-box as much as
possible. Tweaking can quickly turn into a slippery slope of just 1
more here and 1 more there. I figured we can tweak all we want for
more specific needs as they arise.
- The versions of sendmail and postfix were whatever was current stable
in June, compiled locally with default build instructions.
So, given all that, here's the #'s I came up with.
Linux: 47,000 emails/hr
FreeBSD: 66,000 emails/hr
this is about a 40% increase in throughput.
Linux: 86,000 emails/hr
FreeBSD: 223,000 emails/hr
this is about a 260% increase in throughput.
The above data is for FC4 and FBSD 5.4 with softupdates enabled. My
apologies but I can't find the notes for FC3 and FBSD w/o softupdates. FC4
was faster but not by much, and by about the same % for sendmail and postfix.
Softupdates showed a similar pattern(as expected) - not as fast as with
softupdates. IIRC the data for postfix/fbsd w/o softupdates was still
around 190k emails/hr(this is from memory so take it with a grain of salt).
I was amazed at the difference with postfix. Whatever Mr. Venema did inside
postfix really works well on fbsd. Even though I can't find the #'s I
remember my amazement that fbsd w/o softupdates still smoked FC4 when using
Pls remember this is far from a scientific analysis. Your mileage will vary
in many ways. I would recommend doing your own tests with your own criteria.
Randy (schultz at sgi.com) 715-726-2832 email bodhisattva <*>
"There is no fire like passion, there is no shark like hatred,
there is no snare like folly, there is no torrent like greed."
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