netdev - Re: [PATCH 2/2] ipv4: factorize cache clearing for batched unregister operations

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Message-ID: <20091117002238.GH12422@kvack.org>
Date:	Mon, 16 Nov 2009 19:22:38 -0500
From:	Benjamin LaHaise <bcrl@...et.ca>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Octavian Purdila <opurdila@...acom.com>, netdev@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH 2/2] ipv4: factorize cache clearing for batched unregister operations

On Mon, Nov 16, 2009 at 04:06:46PM -0800, Stephen Hemminger wrote:
> And what about IPV6?

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.

		-ben
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