From: Eric Dumazet <eric.dumazet@gmail.com>
To: Denys Fedoryshchenko <denys@visp.net.lb>
Cc: netdev@vger.kernel.org
Subject: Re: 2.6.39-rc7-git11, x86/32, failed on ppp2897'th interface, PERCPU: allocation failed
Date: Thu, 19 May 2011 09:44:31 +0200 [thread overview]
Message-ID: <1305791071.3028.1.camel@edumazet-laptop> (raw)
In-Reply-To: <10f61af229a48d77d06d154b4647cdde@visp.net.lb>
Le jeudi 19 mai 2011 à 10:28 +0300, Denys Fedoryshchenko a écrit :
> On Thu, 19 May 2011 08:55:13 +0200, Eric Dumazet wrote:
> > Le jeudi 19 mai 2011 à 08:39 +0200, Eric Dumazet a écrit :
> >
> >> Its a known problem : When ipv6 is enabled, we allocate percpu
> >> memory to
> >> hold per device snmp counters.
> >>
> >> make sure kernel idea of max possible cpus matches real number of
> >> cpus.
> >>
> >> And yes, switching to 64bit kernel helps a lot.
> >>
> >>
> >
> > Looking at snmp6_alloc_dev(), we allocate three mib per device :
> >
> > ipstats_mib (30 * sizeof(u64) * number_of_possible_cpus)
> > icmpv6_mib (4 * sizeof(long) * number_of_possible_cpus)
> > icmpv6msg_mib (26 * sizeof(long))
> 1920 +
> 256 +
> 208 = 2386 * 3000ppp's = 7152000, i think it is not that much at any
> case, if i am not wrong.
>
> But at any case i will try 64bit.
If you really want to stay 32bit, you might try to enlarge vmalloc aread
(128 Mbytes default) to get room for pcpu data :
grep pcpu /proc/vmallocinfo
boot param : vmalloc=256M
next prev parent reply other threads:[~2011-05-19 7:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-19 6:35 2.6.39-rc7-git11, x86/32, failed on ppp2897'th interface, PERCPU: allocation failed Denys Fedoryshchenko
2011-05-19 6:39 ` Eric Dumazet
2011-05-19 6:47 ` Denys Fedoryshchenko
2011-05-19 6:55 ` Eric Dumazet
2011-05-19 7:28 ` Denys Fedoryshchenko
2011-05-19 7:44 ` Eric Dumazet [this message]
2011-05-19 11:14 ` [PATCH net-next-2.6] ipv6: reduce per device ICMP mib sizes Eric Dumazet
2011-05-19 11:26 ` Denys Fedoryshchenko
2011-05-19 20:19 ` David Miller
2011-05-19 7:51 ` 2.6.39-rc7-git11, x86/32, failed on ppp2897'th interface, PERCPU: allocation failed David Miller
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