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From: Nicolas Cannasse <ncannasse@motion-twin.com>
To: swivel@shells.gnugeneration.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: poll() blocked / packets not received ?
Date: Mon, 20 Oct 2008 14:39:10 +0200	[thread overview]
Message-ID: <48FC7BEE.1020701@motion-twin.com> (raw)
In-Reply-To: <20081020113942.GJ2811@fc6222126.aspadmin.net>

> TCP being reliable can block indefinitely, you can employ TCP keepalive
> to change indefinite to quite a long time.

Ok, funny thing is that we just found what is occurring...

We had a process that was on a regular basis doing the following :

conntrack -F

This was done in order to prevent the table to grow too big, because we 
were reaching the maximum size as told by :

/proc/sys/net/ipv4/netfilter/ip_conntrack_max
   and
/proc/sys/net/ipv4/netfilter/ip_conntrack_count

Seems like when there are active connections, this will break netfilter 
and stop delivering packets to the socket.

At least I will have nice sleep tonight.

Best,
Nicolas

  parent reply	other threads:[~2008-10-20 12:39 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-20  8:25 Nicolas Cannasse
2008-10-20 10:15 ` swivel
2008-10-20 10:46   ` Nicolas Cannasse
2008-10-20 11:39     ` swivel
2008-10-20 12:13       ` Nicolas Cannasse
2008-10-20 12:39       ` Nicolas Cannasse [this message]
2008-10-20 15:53         ` David Schwartz
2008-10-20 17:24           ` Nicolas Cannasse
2008-10-20 23:21             ` David Schwartz
2008-10-21  5:12             ` Willy Tarreau

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