Hello Cathy, I tried to set prefetch 0;
I notice my server got more loaded but I still have periods of 3-5 seconds where there are packets in the revc-q. - Do you have anything else in mind I can try? /Søren -----Oprindelig meddelelse----- Fra: bind-users-boun...@lists.isc.org [mailto:bind-users-boun...@lists.isc.org] På vegne af Cathy Almond Sendt: 4. december 2015 23:13 Til: bind-users@lists.isc.org Emne: Re: Bind bind high recv-q On 04/12/2015 12:34, Tony Finch wrote: > Søren Andersen <s...@stofa.dk> wrote: >> >> I'm experiencing some strange problems with my bind installation. - I >> notice my bind recv-q is quite high sometimes.. therefore my DNS >> clients can experience DNS lookup to take 1-4 secs. My bind is >> running on a 4 core vm I VMware with 8Gb ram. - At peak I receive >> app. 700-800 QPS. - The load is 20-40% on each CPU core. - I've also >> configured 2 RPZ zones. > > Is your server an open resolver being used as part of a DDoS attack? > > Do you have compromised client machines running malware that hammers > your server? > > Find out where the queries are coming from using netflow or tcpdump or > query logging. > > Tony. Also, if your server is not well-connected (if you have slow or intermittent packet drops) between your server and the Internet, then you might be affected by a defect in the prefetch implementation that can impact performance for some server environments. See https://kb.isc.org/article/AA-01315 and see if disabling prefetch helps in your environment. (The problem that this article talks about will be fixed in 9.10.4). _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
