<div dir="ltr">Hi,<div><br></div><div>Do you have a load-balancer in front of Varnish? The decrease looks like the connections are being drained</div><div><br></div><div>Cheers,</div><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>-- <br></div>Guillaume Quintard</div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Oct 26, 2020 at 8:12 AM Sébastien EISSLER <<a href="mailto:sebastien@sdv.fr">sebastien@sdv.fr</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hello,<br>
<br>
We encounter an issue on trafic increase event, here is the timeline:<br>
<br>
- We have normally ~1000 req/s, a event cause the traffic to increase to ~1400 req/s with spike at ~2300.<br>
- Varnish is creating new threads to the limit<br>
- threads_limited counter strongly increase<br>
- Varnish don't response to all requests, req/s decrease slowly to 0 (see attachment)<br>
- A restart of Varnish solved the problem, varnish accept all requests.<br>
<br>
Can you help us identify the problem? Do you need to adjust the configuration?<br>
You can find a param.show in attachement.<br>
<br>
# varnishd -V<br>
varnishd (varnish-6.4.0 revision 13f137934ec1cf14af66baf7896311115ee35598)<br>
Copyright (c) 2006 Verdens Gang AS<br>
Copyright (c) 2006-2020 Varnish Software AS<br>
<br>
We use hitch for TLS support:<br>
<br>
# hitch -V<br>
hitch 1.5.2<br>
<br>
Best Regards,<br>
-- <br>
Sébastien <br>
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</blockquote></div>