From: Eric Dumazet <eric.dumazet@gmail.com>
To: Stephen Hemminger <shemminger@vyatta.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
werner@guyane.dyn-o-saur.com, linux-kernel@vger.kernel.org,
Tejun Heo <tj@kernel.org>,
netdev@vger.kernel.org
Subject: Re: 2.6.33 problems
Date: Wed, 03 Mar 2010 00:30:12 +0100 [thread overview]
Message-ID: <1267572612.2839.70.camel@edumazet-laptop> (raw)
In-Reply-To: <20100302144219.3cd28ae9@nehalam>
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
next prev parent reply other threads:[~2010-03-02 23:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1267290551.13148@guyane.dyn-o-saur.com>
2010-03-02 21:50 ` 2.6.33 problems Andrew Morton
2010-03-02 22:42 ` Stephen Hemminger
2010-03-02 23:30 ` Eric Dumazet [this message]
2010-03-03 0:56 ` Tejun Heo
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