I'm using SpamAssassin on a mail server that's been in production for approximately 6 months now. It's running RELENG_8_0 and bayes is in use.
So far, no serious problems have popped up. However, I'm not using any database backends.
Perhaps the port maintainer might be able to help out.
I only have one thing left to suggest then. Use PF for load balancing incoming connections. This does have some limitations, but it should be able to work well for what you need.
Some references:
Load Balance Incoming Connections
TRANSLATION EXAMPLES
I've always wondered why it isn't possible to limit incoming traffic with PF. It is because of implementation difficulties or something similar?
Wget can limit the download speed with --limit-rate though.
Try tweaking the DNS settings. It's much simpler.
Do something like:
For DNS:
dig +short google.com ns
ns4.google.com.
ns2.google.com.
ns1.google.com.
ns3.google.com.
For NTP:
dig +short 0.pool.ntp.org a
140.112.2.189
210.68.16.24
123.204.57.143
A similar case would be parallel builds (-j flag when using make). Increasing the number does speed things up, but there's a limit. When you go over it, things just stay the same or slow down dramatically.
There is some ongoing work to virtualize the network stack for Jails. However, it isn't complete yet (if I remember correctly), so SirDice's method is probably the only way right now.
I believe the standard-supfile varies according to the version your using:
[dennylin93@cnmc ~]> uname -a
FreeBSD cnmc.tw 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #0: Thu Jan 7 15:21:05 CST 2010 root@cnmc.tw:/usr/obj/usr/src/sys/CNMC amd64
[dennylin93@cnmc ~]> grep tag...
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