Slow connections

Henry Paulissen h.paulissen at
Tue Dec 22 23:58:24 CET 2009

Have a look to the conntrack setting in the kernel (sysctl) on both sides.
It could be that your conntrack is full (connectrack only exists if you use
iptables with netfilter_conntrack).


-----Oorspronkelijk bericht-----
Van: varnish-misc-bounces at
[mailto:varnish-misc-bounces at] Namens Joe Williams
Verzonden: dinsdag 22 december 2009 18:12
Aan: varnish-misc at
Onderwerp: Slow connections

I am seeing a good amount (1/100) of connections to varnish (from 
haproxy) taking 3 seconds. My first thought was the connection backlog 
but somaxconn and listen_depth are both set higher than the number of 
connections. Anyone have any suggestions on how to track down what is 
causing this or settings I can use to try to aleviate it?



Name: Joseph A. Williams
Email: joe at

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