Sporadic Timeouts after upgrading to bind9.20

[Ondřej Surý]

Hi Klaus,

thanks for reporting back. The patch from the Debian package will be included
in the next release, so thank you for the prompt testing. Much appreciated.

Also glad to hear that the XFR speeds improved due to this change.

Ondrej
--
Ondřej Surý (He/Him)
ondrej at isc.org

My working hours and your working hours may be different. Please do not feel obligated to reply outside your normal working hours.

> On 15. 1. 2025, at 8:21, Klaus Darilion <klaus.darilion at nic.at> wrote:
> 
> Hi Ondrey and others!
>  
> I have tested 9.20.4-3+ubuntu24.04.1+deb.sury.org <http://deb.sury.org/>+1 on one of our RcodeZero production nodes for 1 week and have not encountered any timeouts anymore.
> XFR speed also seems fine now.
>  
> Regards
> Klaus
>  
>  
> From: Ondřej Surý <ondrej at isc.org <mailto:ondrej at isc.org>> 
> Sent: Thursday, December 5, 2024 8:36 PM
> To: Klaus Darilion <klaus.darilion at nic.at <mailto:klaus.darilion at nic.at>>
> Cc: Klaus Darilion via bind-users <bind-users at lists.isc.org <mailto:bind-users at lists.isc.org>>
> Subject: Re: Sporadic Timeouts after upgrading to bind9.20
>  
> Hi Klaus,
>  
> we've identified an issue in the glue cache that have been causing drops in the performance.
>  
> Can you test a development branch or do you need fix on top of 9.20?
>  
> Ondrej
> --
> Ondřej Surý (He/Him)
> ondrej at isc.org <mailto:ondrej at isc.org>
>  
> My working hours and your working hours may be different. Please do not feel obligated to reply outside your normal working hours.
> 
> 
> On 9. 9. 2024, at 10:39, Klaus Darilion via bind-users <bind-users at lists.isc.org <mailto:bind-users at lists.isc.org>> wrote:
>  
> As we still have several timeouts I downgraded our server to 9.18. If you know another workaround or need someone to test new version please let me know.
>  
> Thanks
> Klaus
>  
> From: Klaus Darilion <klaus.darilion at nic.at <mailto:klaus.darilion at nic.at>>
> Sent: Saturday, September 7, 2024 12:36 AM
> To: Klaus Darilion <klaus.darilion at nic.at <mailto:klaus.darilion at nic.at>>; Ondřej Surý <ondrej at isc.org <mailto:ondrej at isc.org>>
> Cc: Klaus Darilion via bind-users <bind-users at lists.isc.org <mailto:bind-users at lists.isc.org>>
> Subject: RE: Sporadic Timeouts after upgrading to bind9.20
>  
> Correcting myself: event with { reuseport no; };  and UV_THREADPOOL_SIZE=12 still timeouts happen, but the situation improved a lot.
> Regards
> Klaus
>  
> From: bind-users <bind-users-bounces at lists.isc.org <mailto:bind-users-bounces at lists.isc.org>> On Behalf Of Klaus Darilion via bind-users
> Sent: Saturday, September 7, 2024 12:21 AM
> To: Ondřej Surý <ondrej at isc.org <mailto:ondrej at isc.org>>
> Cc: Klaus Darilion via bind-users <bind-users at lists.isc.org <mailto:bind-users at lists.isc.org>>
> Subject: RE: Sporadic Timeouts after upgrading to bind9.20
>  
>  
> From: Ondřej Surý <ondrej at isc.org <mailto:ondrej at isc.org>>
> Sent: Friday, September 6, 2024 4:08 PM
> To: Klaus Darilion <klaus.darilion at nic.at <mailto:klaus.darilion at nic.at>>
> Cc: Petr Špaček <pspacek at isc.org <mailto:pspacek at isc.org>>; bind-users at lists.isc.org <mailto:bind-users at lists.isc.org>; Klaus Darilion via bind-users <bind-users at lists.isc.org <mailto:bind-users at lists.isc.org>>
> Subject: Re: Sporadic Timeouts after upgrading to bind9.20
>  
> Are your running with options { reuseport no; };  ?
>  
> You might want to try that.
>  
> After setting reuseport no; (and UV_THREADPOOL_SIZE=12) I have not seen any timeouts anymore.
>  
> Anyway, this:
>  
> TID 8917:
> #0  0x00007b385aa6daa9     cds_lfht_destroy - /usr/lib/x86_64-linux-gnu/liburcu-cds.so <http://liburcu-cds.so/>.8.1.0
>  
> caught my eye. Are the zones you are hosting particularly large on GLUE?
>  
> I don’T know and I have not checked yet. One of the affected zones is .ch.  You could download the zone fromhttps://zonedata.switch.ch/ And they are using NSEC (not NSEC3 as I have written before)
>  
>  
>  
> Also if you have more eu-stack, can you confirm this is the pattern now?
>  
> After setting reuseport no; I do not have stack-traces any more. But if that would help you I can undo the workaround next week to collect traces.
>  
> Thanks
> Klaus
>  
>  
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