On Thu, 2015-05-28 at 22:51 +0200, Florian Westphal wrote:
> We store rule blob per (possible) cpu. Unfortunately this means we can
> waste lot of memory on big smp machines. ipt_entry structure ('rule head')
> is 112 byte, so e.g. with maxcpu=64 one single rule eats close to 8k RAM.
>
> Since previous patch moved counters to separate percpu blob, it appears
> there is nothing left in the rule blob that must be percpu.
>
> Thus only duplicate the rule blob for each NUMA node.
>
> On my test system (144 possible cpus, one numa node, 400k dummy rules) this
> change saves close to 9 Gigabyte of RAM.
>
> Reported-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
> Acked-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
> Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
> ---
Really if the program is now readonly, I would keep a single copy in
memory.
Are we copying kernel text to each NUMA node ? ;)
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