netdev - Re: 2.6.33 problems

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Message-ID: <1267572612.2839.70.camel@edumazet-laptop>
Date:	Wed, 03 Mar 2010 00:30:12 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	werner@...ane.dyn-o-saur.com, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, netdev@...r.kernel.org
Subject: Re: 2.6.33 problems

Le mardi 02 mars 2010 à 14:42 -0800, Stephen Hemminger a écrit :

> The SNMP MIB stuff does allocate a disproportionately large amount of percpu
> data. Looks like 2 tables per MIB.

But did this percpu usage grew with 2.6.33 ?

In my understanding, ipv6 always wanted a lot of percpu data for its
MIBS (including per device MIBS), the big increase occurred with commit
96793b482540f3a26e2188eaf75cb56b7829d3e3
from David L Stevens, when RFC 4293 was implemented.
On IPV6, each net device needed 4096/8192 additional bytes of memory per
possible cpu.

An attempt to reduce SNMP mibs by 50% was attempted one ago, but not
completed. I'll try to find some time to resurrect the patch.

[RFC] percpu: convert SNMP mibs to new infra

(use one single table, for both user/bh contexts on x86)

http://lkml.org/lkml/2009/4/1/401

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