From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: OOM when adding ipv6 route: How to make available more per-cpu memory? Date: Mon, 08 Nov 2010 12:02:11 +0100 Message-ID: <1289214131.2820.187.camel@edumazet-laptop> References: <4CD43C87.5040403@candelatech.com> <1288980361.2882.1070.camel@edumazet-laptop> <4CD449A5.5070305@candelatech.com> <1288988403.2665.268.camel@edumazet-laptop> <1288995103.2665.653.camel@edumazet-laptop> <4CD49C2F.3060904@candelatech.com> <1289028392.2665.2418.camel@edumazet-laptop> <4CD58B9C.2030006@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: NetDev , linux-kernel , Tejun Heo To: Ben Greear Return-path: Received: from mail-fx0-f46.google.com ([209.85.161.46]:33589 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754371Ab0KHLCP (ORCPT ); Mon, 8 Nov 2010 06:02:15 -0500 In-Reply-To: <4CD58B9C.2030006@candelatech.com> Sender: netdev-owner@vger.kernel.org List-ID: Le samedi 06 novembre 2010 =C3=A0 10:08 -0700, Ben Greear a =C3=A9crit = : > At least I don't see any percpu dumps in dmesg. I vaguely remember > someone posting some ipv6 address scalability patches some time back. > I think they had to hack on /proc fs as well. I'll see if I can > dig those up. >=20 > > Make sure udev / hotplug is not the problem, if you create your dev= ices > > very fast. >=20 > We can create the macvlans w/out problem, though I'm sure that could > be sped up. The problem is when we try to add IPv6 addresses to > them. I see. Did you check /proc/sys/net/ipv6/ tunables ? =46or example, I bet you need to make route/max_size a bigger value tha= n default (4096) =46ollowing is working for me echo 16384 >/proc/sys/net/ipv6/route/max_size modprobe dummy numdummies=3D2000 for a in `seq 1 1999` do ip -6 add add 4444::444:$a/24 dev dummy$a done ip -6 ro | wc -l 6008