On Sun, Jan 16, 2022 at 09:05:55AM +0100, Otto Moerbeek via Pdns-users wrote:
> On Sun, Jan 16, 2022 at 09:39:01AM +0330, Hamed Haghshenas via Pdns-users > wrote: > > > Hello Dears, > > > > > > > > I install PowerDNS Recursor 4.6.0 on CentOS Linux release 7.9.2009. and > > configure it as bellow for Iran IP address. I want use it in my ISP > > environment for large scale and lots of DNS requests. > > A more modern distribution might be better. What do you call lots? > > > My Server have 4 core 2.6 Ghz (x64) and 8GB Ram (KVM Virtualization), I can > > apply more cpu or ram. > > If you have 8G of RAM, likely the default cache sizes could be > enlarged (max-cache-entries for the record cache and > max-packetcache-entries for the packet cache) > > Virtulization *could* be an issue, for example when the network > interface is virtualized in a way thet hinders performance. > > > Could you please help me that is my configuration correct? How many > > distributor-threads and threads should I use? (same as number of cpu cores > > or more). > > Some comments inline below. > > > > > Need something to change, or any kernel optimization ? > > > > > > allow-from-file=/etc/pdns-recursor/IP-Iran-List.txt > > > > setuid=pdns-recursor > > > > setgid=pdns-recursor > > > > local-address=127.0.0.1 172.16.1.186 > > If you are using NAT: this *kills* the performance. See > https://docs.powerdns.com/recursor/performance.html > > > > > any-to-tcp=yes > > > > distribution-load-factor=1.25 > > > > pdns-distributes-queries=yes > > > > distributor-threads=4 > > Depending on kernel version and other factors resuseports and multiple > distributor thread might work better or not, best to start with > reuserport=no and distributor-threads=1, test & measure and then > change to yes and 4 and compare performance on your actual setup. > > > > > dnssec=validate > > > > dnssec-log-bogus=yes > > If you see a lot ot bogus results this might impact performance > > > entropy-source=/dev/random > > This is likely slow, better use the default setting (leave it out). Correction: this *is* the default. Normally it only is used if rng=urandom, so it does not matter at all. It's best to leave out default settings anyway. > > > > > logging-facility=0 > > > > lowercase-outgoing=yes > > why? > > > max-tcp-queries-per-connection=10 > > > > quiet=no > > This amount of logging will kill performance > > > reuseport=yes > > See above > > > > > threads=4 > > You might want to reduce it to 3 if you use 1 distribnutor thread, as > the total number of threads doing lots of work is distributor threads + > worker threads. This is depedent on your cach hit ratios. Again: > try and measure. > > -Otto > _______________________________________________ > Pdns-users mailing list > Pdns-users@mailman.powerdns.com > https://mailman.powerdns.com/mailman/listinfo/pdns-users _______________________________________________ Pdns-users mailing list Pdns-users@mailman.powerdns.com https://mailman.powerdns.com/mailman/listinfo/pdns-users