netdev - Re: [PATCH net-next-2.6] ipv6: reduce per device ICMP mib sizes

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Date:	Thu, 19 May 2011 14:26:45 +0300
From:	Denys Fedoryshchenko <denys@...p.net.lb>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next-2.6] ipv6: reduce per device ICMP mib sizes

 On Thu, 19 May 2011 13:14:23 +0200, Eric Dumazet wrote:
> Le jeudi 19 mai 2011 à 08:55 +0200, Eric Dumazet a écrit :
>
>> 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))
>>
>
> Oops, I forgot that mibs were doubled (one set for USER, one set for 
> BH)
>
> And :
> #define __ICMP6MSG_MIB_MAX 512
>
> So icmpv6msg_mib is really 512*sizeof(long)*number_of_possible_cpus*2
>
> 32 kbytes per device on a 8cpu machine, 32bit kernel.
>
> Plus all other mibs... yes thats way too big for a seldom used stuff.
>
> Here is patch I cooked and tested on my machine :
>
> [PATCH net-next-2.6] ipv6: reduce per device ICMP mib sizes.

 I'll test it tonight, thanks a lot :-)
 I guess it will help also for people with lot of interfaces 
 (virtualisation?), not only ppp.

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