Re: poll() blocked / packets not received ?
From: Nicolas Cannasse
Date: Mon Oct 20 2008 - 08:39:27 EST
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
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