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

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Date:	Mon, 23 Mar 2009 19:04:10 +0100
From:	Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	avorontsov@...mvista.com, Patrick McHardy <kaber@...sh.net>,
	netdev@...r.kernel.org
Subject: Re: ucc_geth: nf_conntrack: table full, dropping packet.

Eric Dumazet <dada1@...mosbay.com> wrote on 23/03/2009 18:49:38:

> 
> 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 ?

Just one, it is an embedded board running at 266 MHz

> 
> What kernel version do you use ?

Linus tree as of Friday

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