netdev - Re: [PATCH 1/4] netns: Tag the network flow with the network namespace it is in (v2)

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Message-ID: <47559FA9.2080109@sw.ru>
Date:	Tue, 04 Dec 2007 21:42:49 +0300
From:	"Denis V. Lunev" <den@...ru>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
CC:	"Denis V. Lunev" <den@...nvz.org>, davem@...emloft.net,
	devel@...nvz.org, netdev@...r.kernel.org, containers@...ts.osdl.org
Subject: Re: [PATCH 1/4] netns: Tag the network flow with the network namespace
 it is in (v2)

Stephen Hemminger wrote:
> Can this be made conditional on network namespaces being configured on?
> That way the flow structure won't have to grow taking more space.
> It matters in DoS attacks where flow cache becomes a critical resource.

could you exactly point me out the flow cache your are talking about.
Is this dst entry cache or struct flow_cache described in the
net/core/flow.c

For the latter case, there is completely no difference in the size on my
x86_64 host with SLAB allocator, i.e. there are 30 objects per slab
with/without fl_net (objsize = 128).

Regards,
	Den

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