Traffic drop issue

[Guillaume Quintard]

Hi,

Do you have a load-balancer in front of Varnish? The decrease looks like
the connections are being drained

Cheers,

-- 
Guillaume Quintard

On Mon, Oct 26, 2020 at 8:12 AM Sébastien EISSLER <sebastien at sdv.fr> wrote:

> Hello,
>
> We encounter an issue on trafic increase event, here is the timeline:
>
> - We have normally ~1000 req/s, a event cause the traffic to increase to
> ~1400 req/s with spike at ~2300.
> - Varnish is creating new threads to the limit
> - threads_limited counter strongly increase
> - Varnish don't response to all requests, req/s decrease slowly to 0 (see
> attachment)
> - A restart of Varnish solved the problem, varnish accept all requests.
>
> Can you help us identify the problem? Do you need to adjust the
> configuration?
> You can find a param.show in attachement.
>
> # varnishd -V
> varnishd (varnish-6.4.0 revision 13f137934ec1cf14af66baf7896311115ee35598)
> Copyright (c) 2006 Verdens Gang AS
> Copyright (c) 2006-2020 Varnish Software AS
>
> We use hitch for TLS support:
>
> # hitch -V
> hitch 1.5.2
>
> Best Regards,
> --
> Sébastien
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>
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