varnish-misc Digest, Vol 117, Issue 14

Phil Stanhope stanhope at
Wed Dec 16 06:27:00 CET 2015

Please share the stats for 150Gbs. 

And the config scenarios. That would be great to share. 

And the hardware configs. On metal? If not, how?


On Dec 15, 2015, at 03:00, varnish-misc-request at wrote:

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Today's Topics:

  1. Re: thread_pool_max (Viktor Villafuerte)
  2. Re: Why varnish caches as the cache is stopped?
     (Guillaume Quintard)


Message: 1
Date: Tue, 15 Dec 2015 09:20:01 +1100
From: Viktor Villafuerte <viktor.villafuerte at>
To: Per Buer <perbu at>
Cc: Varnish <varnish-misc at>
Subject: Re: thread_pool_max
Message-ID: <20151214222001.GC1490 at>
Content-Type: text/plain; charset=utf-8

Hi Per,

> On Fri 11 Dec 2015 08:36:06, Per Buer wrote:
> On Fri, Dec 11, 2015 at 5:19 AM, Viktor Villafuerte <
> viktor.villafuerte at> wrote:
>> Ladies, gents
>> In the Varnish on-line docs (section Tuning) there's a paragraph that
>> states:
>> "We rarely recommend running with more than 5000 threads. If you
>> seem to need more than 5000 threads, it?s very likely that there is
>> something not quite right about your setup.."
> Those are my words. 99% installation have a request rate under 2-3000
> request per second and 5000 threads is more than enough. We've seen quite a
> few people adding tens of thousands of threads. I should probably replace
> with something like a formula.
> There are no well defined limits wrt capacity but in general people seem to
> struggle to push Varnish significantly beyond 15Gbps with real with
> traffic. I have not experienced this first hand and nobody has given me
> access to a live server with those kind of traffic numbers on it. Also,
> nobody get particularly specific wrt what breaks. I think it definitely
> should be possible to reach 20Gbps without any issue, but that is more an
> opinion than a fact.

Would you guys like to have some stats when we reach traffic levels over
15Gbps? If yes then what stats would you like?

Currently we're running at 12Gbps very comfortably with 2 pools of 15k

> With synthetic traffic it is no problem reaching 80Gbps.
> -- 
> *Per Buer*
> CTO | Varnish Software AS
> Cell: +47 95839117
> We Make Websites Fly!
> <>


Viktor Villafuerte
Optus Internet Engineering
t: +61 2 80825265


Message: 2
Date: Tue, 15 Dec 2015 09:58:44 +0100
From: Guillaume Quintard <guillaume at>
To: " at" < at>
Cc: varnish-misc at
Subject: Re: Why varnish caches as the cache is stopped?
   <CAJ6ZYQysTcTaa9TNo0SmxyYgeLbbNnw-R=R5LkHmB2B8_d7e+A at>
Content-Type: text/plain; charset="utf-8"

Why wouldn't it be cached? Sorry but I'm not getting the problem here.

Guillaume Quintard

On Mon, Dec 14, 2015 at 6:56 PM, at < at>

> Yes, but the result were cached and can't understand why. While it's
> cached on port 80 where the varnish is, opening the page with :8080 was ok
> (on the apache side). Any other suggestions?
>> On 12/14/2015 07:04 PM, Guillaume Quintard wrote:
>> Server: Apache
>>>   16 TxHeader     c Content-Type: text/html; charset=UTF-8
>>>   16 TxHeader     c Content-Length: 0
>>>   16 TxHeader     c Accept-Ranges: by
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