netdev - Re: ctnetlink loop

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Message-ID: <20101208203121.GB23668@mail.eitzenberger.org>
Date:	Wed, 8 Dec 2010 21:31:21 +0100
From:	Holger Eitzenberger <holger@...zenberger.org>
To:	David Miller <davem@...emloft.net>
Cc:	pablo@...filter.org,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: ctnetlink loop

Hi,

> Holger, this replay -EAGAIN loop in nfnetlink processing was added by
> Pablo to handle module loading properly, I think.  So it might not be
> safe to just unilaterally remove it.

thanks for your reply!

Pablo, do we really need the replay loop really?  I now have several
boxes with problems due to this replay.  'perf report' always gives me
something like:

      18.88%            ulogd  [kernel]
  [k] __nla_put
      10.73%            ulogd  [kernel]
  [k] nla_parse
       8.72%            ulogd  [kernel]
  [k] __nla_reserve
       6.64%            ulogd  [kernel]
  [k] nla_put
       5.14%            ulogd  [kernel]
  [k] validate_nla
       5.03%            ulogd  [kernel]
  [k] pskb_expand_head
       4.92%            ulogd  [kernel]
  [k] ctnetlink_fill_info [nf_conntrack_netlink]
       3.07%            ulogd  [kernel]
  [k] skb_put
       3.03%            ulogd  [kernel]
  [k] ctnetlink_dump_counters [nf_conntrack

And 'strace' shows me that ulogd is stuck in its 'select' call.

 /holger
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