Connections dropped under load

[Caunter, Stefan]

Hi George, 

I assumed your management access is on port 6082. Adjust to your configured varnishd please. 

Thread creation and pool size monitoring is essential to handling traffic spikes. If load test exceeded the configured available maximums varnish will drop connections, cache hit or no. 

A thread is required to answer a network connection. You don't get something for nothing. Unless varnish has resources to get that cached object, it cannot do anything for your requesting clients, real or test. 

Sent from my iPhone

On 2011-01-10, at 15:55, "George Georgovassilis" <g.georgovassilis at gmail.com> wrote:

> Hello Stefan,
> 
> For every of the commands you quoted I'm getting an
> 
> connect(): Invalid argument
> Connection failed
> 
> 
> Why are threads relevant? As I wrote earlier, everything is answered from within the varnish cache - I thought the entire epolling parade was about avoiding caches.
> I published the threadsettings earlier in this discussion.
> 
> Regards,
> G.
> 
> On 10.01.2011 19:50, Caunter, Stefan wrote:
>> Yes, and I also don't understand why there is no discussion of threads
>> here. If we can see
>> 
>> varnishadm -T 6082 param.show thread_pools
>> varnishadm -T 6082 param.show thread_pool_min
>> varnishadm -T 6082 param.show thread_pool_max
>> varnishadm -T 6082 param.show thread_pool_add_delay
>> 
>> it would be helpful.
>> 
>> The only time I've seen varnish drop connections is when it cannot
>> create threads quickly enough, or has insufficient resources to do so.
>> 
>> Stefan Caunter
>> e: scaunter at topscms.com  ::  m: (416) 561-4871
>> www.thestar.com
>> 
>> 
>> -----Original Message-----
>> From: varnish-misc-bounces at varnish-cache.org
>> [mailto:varnish-misc-bounces at varnish-cache.org] On Behalf Of Kristian
>> Lyngstol
>> Sent: January-06-11 4:00 AM
>> To: George Georgovassilis
>> Cc: varnish-misc at varnish-cache.org
>> Subject: Re: Connections dropped under load
>> 
>> Hi,
>> 
>> On Wed, Jan 05, 2011 at 04:20:31PM +0100, George Georgovassilis wrote:
>>> I'm having trouble with dropped connections under a loadtest.
>> We need:
>> 
>> varnishstat -1
>> 
>> Any further discussion without varnishstat -1 output is wild guesswork
>> and
>> superstition.
>> 
>> - Kristian
>> 
>> _______________________________________________
>> varnish-misc mailing list
>> varnish-misc at varnish-cache.org
>> http://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
> 
> 
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