Slow connections

[Joe Williams]

1) Yes, net.ipv4.tcp_fin_timeout = 3

2) Sometimes, for some backends we do not use httpclose for others we do.


-Joe



On 12/22/09 3:41 PM, Henry Paulissen wrote:
> Next one.
>
> Did you tune the tcp fin timeout? (on both servers)
> Linux will standard holds all connection open till it hits the fin timeout
> length (tcp_fin and tcp_fin2).
> We decreased it to 3.
>
> HAProxy support:
> Do you forced a http connection close in haproxy?
> If all connections are in keep-alive your queue will fill up real quick.
>
> Henry
>
> -----Oorspronkelijk bericht-----
> Van: Joe Williams [mailto:joe at joetify.com]
> Verzonden: woensdag 23 december 2009 0:23
> Aan: Henry Paulissen
> CC: varnish-misc at projects.linpro.no
> Onderwerp: Re: Slow connections
>
>
> Thanks Henry, nf_conntrack_max is set high on both machines. I've had
> the full table issue before :P
>
>
>
> On 12/22/09 2:58 PM, Henry Paulissen wrote:
>    
>> 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).
>>
>> Regards,
>> Henry
>>
>> -----Oorspronkelijk bericht-----
>> Van: varnish-misc-bounces at projects.linpro.no
>> [mailto:varnish-misc-bounces at projects.linpro.no] Namens Joe Williams
>> Verzonden: dinsdag 22 december 2009 18:12
>> Aan: varnish-misc at projects.linpro.no
>> 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?
>>
>> Thanks.
>>
>> -Joe
>>
>>
>>      
>    

-- 
Name: Joseph A. Williams
Email: joe at joetify.com
Blog: http://www.joeandmotorboat.com/