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

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Message-ID: <OFBD3D31D8.7AD81126-ONC1257583.002C5C2B-C1257583.002DFF13@transmode.se>
Date:	Tue, 24 Mar 2009 09:22:24 +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 18:49:15:
> 
> Joakim Tjernlund wrote:
> > Patrick McHardy <kaber@...sh.net> wrote on 23/03/2009 13:29:33:
> >
> > 
> >>> 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?
> 
> No. As I said, something seems to be leaking packets. You should be
> able to confirm that by checking the sk_buff slabs in /proc/slabinfo.
> If that *doesn't* show any signs of a leak, please run "conntrack -E"
> to capture the conntrack events before the "table full" message
> appears and post the output.

skbuff does not differ much, but others do

Before ping:
  skbuff_fclone_cache    0      0    352   11    1 : tunables   54   27 0 
: slabdata      0      0      0
  skbuff_head_cache     20     20    192   20    1 : tunables  120   60 0 
: slabdata      1      1      0
  size-64              731    767     64   59    1 : tunables  120   60 0 
: slabdata     13     13      0
  nf_conntrack          10     19    208   19    1 : tunables  120   60 0 
: slabdata      1      1      0

During ping: 
  skbuff_fclone_cache    0      0    352   11    1 : tunables   54   27 0 
: slabdata      0      0      0
  skbuff_head_cache     40     40    192   20    1 : tunables  120   60 0 
: slabdata      2      2      0
  size-64             8909   8909     64   59    1 : tunables  120   60 0 
: slabdata    151    151      0
  nf_conntrack        5111   5111    208   19    1 : tunables  120   60 0 
: slabdata    269    269      0

This feels more like the freeing of conntrack objects are delayed and 
builds up when ping flooding.

Don't have "conntrack -E" for my embedded board so that will have to wait 
a bit longer.

 Jocke
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