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
next prev 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 poll() blocked / packets not received ? 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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