netdev - Re: [PATCH nf-next 8/9] netfilter: conntrack: use a single hashtable for all namespaces

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Message-ID: <20160429150450.GR17538@breakpoint.cc>
Date:	Fri, 29 Apr 2016 17:04:50 +0200
From:	Florian Westphal <fw@...len.de>
To:	Florian Westphal <fw@...len.de>
Cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH nf-next 8/9] netfilter: conntrack: use a single hashtable
 for all namespaces

Florian Westphal <fw@...len.de> wrote:
> We already include netns address in the hash and compare the netns pointers
> during lookup, so even if namespaces have overlapping addresses entries
> will be spread across the table.
> 
> Assuming 64k bucket size, this change saves 0.5 mbyte per namespace on a
> 64bit system.
> 
> NAT bysrc and expectation hash is still per namespace, those will
> changed too soon.
> 
> Future patch will also make conntrack object slab cache global again.
> 
> @@ -1527,7 +1528,6 @@ i_see_dead_people:
>  	}
>  
>  	list_for_each_entry(net, net_exit_list, exit_list) {
> -		nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size);

Removing this is ok, but nf_ct_free_hashtable() must now be called in
nf_conntrack_cleanup_end().

I'll wait with v2 for a couple of days.