netdev - Re: ucc_geth: nf_conntrack: table full, dropping packet.

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Message-ID: <49C7CBB2.4020205@cosmosbay.com>
Date:	Mon, 23 Mar 2009 18:49:38 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
CC:	Patrick McHardy <kaber@...sh.net>, avorontsov@...mvista.com,
	netdev@...r.kernel.org
Subject: Re: ucc_geth: nf_conntrack: table full, dropping packet.

Joakim Tjernlund a écrit :
> Patrick McHardy <kaber@...sh.net> wrote on 23/03/2009 13:29:33:
> 
>> Joakim Tjernlund wrote:
>>> Patrick McHardy <kaber@...sh.net> wrote on 23/03/2009 13:15:45:
>>>> Joakim Tjernlund wrote:
>>>>> doing a "ping -f -l 3" on my host towards my board on linus tree as 
> of 
>>>>> Friday results in lots of:
>>>>> nf_conntrack: table full, dropping packet.
>>>>> nf_conntrack: table full, dropping packet.
>>>>> nf_conntrack: table full, dropping packet.
>>>>> __ratelimit: 11 callbacks suppressed
>>>>> nf_conntrack: table full, dropping packet.
>>>>> nf_conntrack: table full, dropping packet.
>>>>> nf_conntrack: table full, dropping packet.
>>>>> nf_conntrack: table full, dropping packet.
>>>>>
>>>>> for ucc_geth on a MPC832x.
>>>>> This really looks strange to me, ideas?
>>>> What does /proc/net/netfilter/nf_conntrack show?
>>> There is no /proc/net/netfilter/nf_conntrack. There is a
>>> /proc/net/nf_conntrack though and it is empty. If I telnet
>>> to the board I see:
>> That means that something is leaking conntrack references, most likely
>> by leaking skbs. Since I haven't seen any other reports, my guess would
>> be the ucc_geth driver.
>>
> 
> Mucking around with the ucc_geth driver I found that if I:
>  - Move TX from IRQ to NAPI context
>  - double the weight.
>  - after booting up, wait a few mins until the JFFS2 GC kernel thread has 
> stopped
>    scanning the FS 
> 
> Then the "nf_conntrack: table full, dropping packet." msgs stops.
> Does this seem right to you guys?
> 

How many cpus do you have ?

What kernel version do you use ?

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