My best tip for tuning performance:
Don't until performance becomes an issue otherwise you have no
basis of determining whether performance has improved.
Let me add a second tip:
Don't tune a parameter unless you know what is does.
While probably not popular, those are very good tips.
I can give you some comparative performance info using CentOS3 and
CentOS4. CentOS5 will probably give equal or slightly better
performance depending on specific configurations.
Harware:
4 Dell PowerEdge 350's (2 routers, 2 NAT firewalls)
PIII-850
512 Mb RAM
Bandwidth:
Average 25-35Mbps
Peak 80Mbps sustained for 1-2 hours
10k-25k connections
NAT Firewall:
CPU usage approx 2-8%
Router:
CPU usage approx 2-4%
With the above specs, I was approaching the connection threshold with
512Mb RAM (32768 = theoretical max) and beginning to drop connections.
This was quickly fixed by adding an additional 512Mb RAM and
adjusting the CONNTRACK_MAX accordingly.
Hope this helps. All boxes were running Keepalived for failover.
Fairly straight forward routing so no software used except routing
tables, IP, and IP forwarding.
Hope this helps!
-Ken
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