AW: Varnish VMods for Version 6.1?
Winkelmann, Thomas (RADIO TELE FFH - Online)
t.winkelmann at ffh.de
Fri Sep 21 11:50:43 UTC 2018
I again did some testing by settings the params to
The document says https://varnish-cache.org/docs/trunk/reference/varnishd.html that thread_pool_reserve is a value from 0 to 95. It's working fine on one of our two servers which have less load (300 req/s) than the primaray one (> 800req/s).
On the primary one you can see decreasing the client.req in varnishstat two seconds after restarting hitch with H/2 enabled. It jumps from 100req/s to 1700req/s from one second to the next.
Von: Dridi Boukelmoune [mailto:dridi at varni.sh]
Gesendet: Freitag, 21. September 2018 10:56
An: Winkelmann, Thomas (RADIO TELE FFH - Online)
Betreff: Re: Varnish VMods for Version 6.1?
On Thu, Sep 20, 2018 at 3:51 PM Winkelmann, Thomas (RADIO TELE FFH -
Online) <t.winkelmann at ffh.de> wrote:
> Just tested these values. Varnish is nearly dead after restarting with these new values. Only a few requests will be served. I think, we have to wait :)
I guess now would be a good time to bring back h2load. If you increase
thread_pool_min to 2000 (a value that shouldn't be unreasonable) that
brings the thread_pool_reserve to 400, so even if I didn't bump it further
to 500 it'd be in the same ballpark. And if that is enough to bring Varnish
to a crawl we may have a deeper problem here.
As a general rule of thumb we recommend a thread_pool_min sized for
high (for a given definition of high, let's say above average) traffic so that
sudden peaks of traffic wouldn't wait too long for threads to be created.
I don't see why that should become a problem with Varnish 6 :-/
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