netdev - Re: [RFC] make per interface sysctl entries configurable

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Date:	Mon, 26 Oct 2009 00:32:32 +0200
From:	Denys Fedoryschenko <denys@...p.net.lb>
To:	Octavian Purdila <opurdila@...acom.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Benjamin LaHaise <bcrl@...et.ca>,
	Stephen Hemminger <shemminger@...tta.com>,
	Cosmin Ratiu <cratiu@...acom.com>, netdev@...r.kernel.org
Subject: Re: [RFC] make per interface sysctl entries configurable

On Monday 26 October 2009 00:21:48 Octavian Purdila wrote:

> Very good point, I think this is the best solution for people using a
> moderately high number of interfaces (a few thousand).
>
> But for really large setups there is another issue: memory consumption. In
> fact, in order to be able to scale to 128K interfaces and still have a
> significant amount of memory available to applications we also had to
> disable sysfs and #ifdef CONFIG_SYSFS struct device from net_device.
>
> I would also argue that when you have such a large number of interfaces you
> don't need to change setting on a per interface basis. Or at least this is
> our case :)  and I suspect that the case with a large number of PPP
> interfaces is similar.
I will add also, sysctl -a (over busybox) on pppoe with 2k interfaces takes 
ages to complete.
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