On Tue, 2007-09-11 at 13:43 -0400, Ken Price wrote:
> >> 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
>
Ken,
In your configuration did you tune any sysctl settings or leave with
defaults?
Graham Johnston
Manager, Network Services
Westman Communications Group
204.571.7225
johnstong@xxxxxxxxxxxxxx
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