Varnish 2.0.6 thread pile-up

[Dennis Hendriksen]

Hello Flavio,

I've tried to disable syncookies, but it didn't help. Sending syncookies
is most likely an effect and not the cause. 

Anyone else who has an idea?

Greetings,
Dennis 

On Mon, 2010-12-20 at 12:01 -0200, Flavio Torres wrote:
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> On 12/20/2010 09:05 AM, Dennis Hendriksen wrote:
> > Furthermore we sometimes see the following in /var/log/messages:
> > Dec 19 22:40:04 cache1 kernel: possible SYN flooding on port 80. Sending
> > cookies.
> > Dec 19 22:41:05 cache1 kernel: possible SYN flooding on port 80. Sending
> > cookies.
> 
> Try to change at your sysctl.conf the following value:
> 
> net.ipv4.tcp_syncookies = 0
> 
> 
> See: http://www.varnish-cache.org/trac/wiki/Performance
> 
> 
> hope this helps
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