netfilter performance dependent on arch

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Hi,

Can anyone point me to some performance comparison of netfilter on i686
and x86_64? I have a few linux routers doing a lot of firewalling and
QoS. Currently those routers use i686 arch on 64-bit hardware. Would I
notice any performance gain after moving to 64-bit kernel?

Next question. On some routers I don't need statefull firewall at all
and I have NOTRACT as a default rule in raw netfilter table. What is
the expected performance gain if I would fully disable conntrack
instead of using NOTRACK target? What would be the best approach to do
it on debian squeeze distribution kernel (nf_conntrack compiled as a
module)? Is blacklisting nf_conntrack module enough (to be safe in case
of accidental addition of statefull rule)?

best regards,
Marek Kierdelewicz
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