As for the file descriptors, I already added the following: - in sysctl.conf : fs.file-max = 65535 - in /etc/init.d/pdns-recursor #!/bin/sh # chkconfig: - 80 75 # description: pdns_recursor is a versatile high performance recursing nameserver ulimit -HSn 65536
How can I know that the above settings are working? with squid for example, I can know by doing squidclient -p port mgr:info.... Please advise. Thanking you in advance > Date: Sun, 6 Feb 2011 14:34:36 +0100 > From: bert.hub...@netherlabs.nl > To: maroon_ibra...@hotmail.com > CC: pdns-users@mailman.powerdns.com > Subject: Re: [Pdns-users] PDNS Recursor on Debian / Low performance > !!!URGENT!!!! > > Hi!!!! Please se my answers below. > > On Sun, Feb 06, 2011 at 12:35:35PM +0000, Maroon Ibrahim wrote: > > Dear PDNS Admins/Users > > I have installed PDNS Recursor on Debian Lenny 64-bit with kernel 2.6.32 > > (downloaded the PDNS Recursore .deb from www.powerdns.com webpage) and > > install it using dpkg -i pdn_recursor_3.3.deb > > As for the setup, all went fine so far !!! > > Great!!! > > > But i ran queryperf -q 4000 -d queries (3million record) -l 120 and I > > noticed lots of query timed out and ended up with a very bad result almost > > 143 qps !!!! > > If you want to run with 4000 parallel, which is a lot, you'll need to add > more filedescriptors on Linux. This can be achieved by setting 'ulimit -n > 16384' before starting the recursor. > > Can you try to reproduce your problem with -q 1000 first? > > > Do I need to fine tune the kernel? or is there any tweaks in powerdns > > recursor i have missed ? do you recommend to manually compile powerdns > > recusor?? please advise > > it is really urgent > > In addition, if you run with this many parallel queries, please read > http://doc.powerdns.com/recursor-performance.html > > Especially this bit about iptables. > > Good luck!!! > > Bert
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