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). > > 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
