[Pdns-users] PDNS Recursor on Debian / Low performance !!!URGENT!!!!

[Maroon Ibrahim]

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.hubert at netherlabs.nl
> To: maroon_ibrahim at hotmail.com
> CC: pdns-users at 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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