Re: netfilter queue throughput slowdown

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Le jeudi 30 juin 2011 à 15:24 -0700, Sam Roberts a écrit :
> On Thu, Jun 30, 2011 at 8:15 AM, Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote:
> > Le jeudi 30 juin 2011 à 13:59 +0200, Patrick McHardy a écrit :
> >
> >> Thanks Eric, I agree. Give us data and we'll fix it if really is a bug.
> >>
> >> The fact that the timeout patch apparently helps indicates that some
> >> packets don't receive verdicts.
> >
> > My rough guess is that this user application gets an error in its
> > nfq_set_verdict() call ( maybe a transient out of memory indication) and
> > packet never gets its verdict.
> 
> Hows does ENOBUFS interact with the queue? Is it possible that the
> kernel->userspace notification of the packet id gets dropped, and
> userspace is thus never notified of the packet id, and can't issue a
> verdict?

Its not possible.

If a paquet is in QUEUE, it means a friend packet was also queued on the
netlink socket.



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