Varnish Lurker is getting slower / Ban lists keeps increasing

Olivier Hanesse olivier.hanesse at
Mon Sep 4 12:12:20 UTC 2017


I got some news about this issue :

The "MAIN.bans_lurker_obj_killed_cutoff" value has increased from 0 to
"322451" in one update ! (i am polling this value every minute). The ban
list size was around 100k when this has happened.
And I can see at the same time, a drop of the "n_object" value (this is
normal and expected).

Are the stats used by varnishstat about the lurker "well" updated "every
minute" ? The fact that the statistics was only updated once is kinda
strange : the ban list size is higher than the cutoff value everyday :(



2017-08-30 15:41 GMT+02:00 Olivier Hanesse <olivier.hanesse at>:

> Ok, so I could upgrade the cutoff parameter to 70K (bans_lurker_tests_tested
> is around 1.4M)
> I will keep it at 18500 to debug this ban list behaviour.
> 2017-08-30 15:14 GMT+02:00 Nils Goroll <slink at>:
>> On 30/08/17 11:44, Olivier Hanesse wrote:
>> > 50ms of latency, 370K/s ban.lurker.tested
>> BTW, the value to be used for the calculation is
>> rate(bans_lurker_tests_tested)
>> not rate(bans_lurker_tested)
>> I've also just improved the documentation of ban_cutoff in master.
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