Varnish Lurker is getting slower / Ban lists keeps increasing

Olivier Hanesse olivier.hanesse at
Wed Aug 30 08:47:41 CEST 2017

Hello Dridi,

Thanks for your reply.
I must admit I didn't understand perfectly the description of this option.

What will happen when the ban list hits the size of bans defined in
ban_cutoff value ?

Will the ban list be truncated and all the previous (oldest ?) bans will be
simply deleted without purging the cache ?
Or will varnish suspend other regular requests (increasing the lurker
priority thread , something like that ?) until the ban list size is under
this value ?



2017-08-29 19:04 GMT+02:00 Dridi Boukelmoune <dridi at>:

> > I've already tried to change (increase/decrease) both "ban_lurker_batch"
> and
> > "ban_lurker_sleep" parameters. Same things.
> >
> > I don't know how I can get more lurker logs to debug this.
> > Is there a way to make it more aggressive ?
> >
> > Any ideas ?
> Did you look at the ban_cutoff parameter?
> I think it landed in the 5.1 series.
> Dridi
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