Re: [PATCH 0/3] netfilter : 3 patches to boost ip_tables performance

[Harald Welte]

On Thu, Sep 22, 2005 at 05:50:49PM +0200, Eric Dumazet wrote:
> Christoph Lameter a écrit :
> >It should really be do_set_mempolicy instead to be cleaner. I got a patch here that fixes the 
> >policy layer.
> >But still I agree with Christoph that a real vmalloc_node is better. There will be no fuzzing 
> >around with memory policies etc and its certainly better performance wise.
> 
> vmalloc_node() should be seldom used, at driver init, or when a new
> ip_tables is loaded. If it happens to be a performance problem, then
> we can optimize it.  Why should we spend days of work for a function
> that is yet to be used ?

I see a contradiction in your sentence.  "a new ip_tables is loaded"
every time a user changes a single rule.  There are numerous setups that
dynamically change the ruleset (e.g. at interface up/down point, or even
think of your typical wlan hotspot, where once a user is authorized,
he'll get different rules.

-- 
- Harald Welte <laforge@xxxxxxxxxxxxx>                 http://netfilter.org/
============================================================================
  "Fragmentation is like classful addressing -- an interesting early
   architectural error that shows how much experimentation was going
   on while IP was being designed."                    -- Paul Vixie

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