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    SubjectRe: [PATCH 0/3] netfilter : 3 patches to boost ip_tables performance
    Date
    On Friday 23 September 2005 19:09, Harald Welte wrote:
    > On Thu, Sep 22, 2005 at 03:03:21PM +0200, Andi Kleen wrote:
    > > > 1) No more central rwlock protecting each table (filter, nat, mangle,
    > > > raw), but one lock per CPU. It avoids cache line ping pongs for each
    > > > packet.
    > >
    > > Another useful change would be to not take the lock when there are no
    > > rules. Currently just loading iptables has a large overhead.
    >
    > This is partially due to the netfilter hooks that are registered (so we
    > always take nf_hook_slow() in the NF_HOOK() macro).

    Not sure it's that. nf_hook_slow uses RCU, so it should be quite
    fast.

    > The default policies inside an iptables chain are internally implemented
    > as a rule. Thus, policies as built-in rules have packet/byte counters.

    That could be special cased and done lockless, with the counting
    done per CPU.

    -Andi
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