netdev - Re: Slow OOM in netif

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Message-ID: <4798E32E.6080003@cosmosbay.com>
Date:	Thu, 24 Jan 2008 20:12:46 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Ivan Dichev <idichev@....bg>
CC:	netdev@...r.kernel.org
Subject: Re: Slow OOM  in netif_RX function

Ivan Dichev a écrit :
> Hello,
> I got problem with my linux router. It has slow persistent OOM
> problems from few months ago.
> Every working(I mean days when more traffic is generated) day my
> router is leaking with 15-20 MB memory and
> after 2 weeks the restart is a MUST.
>>>From /proc/slabinfo I saw that size-2048 and size-512 are growing
> rapidly every day when traffic occur.
> 
> --------- /proc/slabinfo --------------------
> size-2048          20322  20349   2072    3    2 : tunables   24  
> 12    0 : slabdata   6780   6783      0
> size-512           50984  51016    536    7    1 : tunables   32  
> 16    0 : slabdata   7288   7288      0
> 
> 
> I was wondering who is allocating this mem pools and then I changed
> the kernel with 2.6.23-rc12 including  options
> CONFIG_DEBUG_SLAB=y
> CONFIG_DEBUG_SLAB_LEAK=y
> 
> 
> Unfortunately changing the kernel didn't solve the mem leak....
> Now /proc/slab_allocators is showing that 3c59x driver is allocating
> 2048 and 512 bytes memory pools
> caused by RX function.
> --------- from /proc/slab_allocators ------------------------------
> 7612 size-2048: boomerang_rx+0x33b/0x437 [3c59x]
> 16018 size-512: boomerang_rx+0x165/0x437 [3c59x]
> 
> I was thinking that the 3com driver is bogus, .. but not!
> After few days I changed the cards with rtl8139 and now ....
> --------- from /proc/slab_allocators ------------------------------
> size-2048: 20159 rtl8139_rx+0x155/0x2dc [8139too]
> size-1024: 2693 rtl8139_rx+0x155/0x2dc [8139too]
> size-512: 50515 rtl8139_rx+0x155/0x2dc [8139too]
> 
> the memory leak appear again in the same function(RX).
> 
> I did search over the mailing list and found as similar only this
> http://www.spinics.net/lists/kernel/old/2003-q4/msg03071.html
> 
> 
> For sure it does not depend on kernel version and network
> driver(except case if both drivers are bogus :)
> Any ideas ?
> 

Could you post your iptable rules "iptables -t nat -nvL ; iptables -nvL", and 
full "cat /proc/slabinfo" ?


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