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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH 2/2] ipv4: factorize cache clearing for batched
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Date: Tue, 17 Nov 2009 00:35:19 -0800 (PST)
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From: Benjamin LaHaise <bcrl@lhnet.ca>
Date: Mon, 16 Nov 2009 19:22:38 -0500

> It's not possible to create more than a few thousand IPv6 interfaces in 
> my tests with a 4GB vm.  The culprit seems to be the per-cpu arrays for 
> statistics using vmalloc() and wasting gobs of memory as a result (memory 
> usage seems to be 10x per interface vs what IPv4 is using), but I haven't 
> dug too deeply yet.

That definitely should be fixed.