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

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Date:	Mon, 23 Mar 2009 18:42:55 +0100
From:	Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	avorontsov@...mvista.com, netdev@...r.kernel.org
Subject: Re: ucc_geth: nf_conntrack: table full, dropping packet.

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?

 Jocke
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