Re: [Pdns-users] Acheiving 40,000 QPS
Looks like I've narrowed down the issue from this setup. The issue was one of concurrency... by boosting it up to 4000 outstanding, I was able to break over the 30,000 per second mark. It's quite possible that some combination of settings means we need to run more concurrent queries to reach ./queryperf -q 4000 -l 60 < queryfile-example-3million Given the hardware is below what I thought we were running on, I'm quite happy with the performance level -- further, the fact it only dropped 1.26% of queries when running at this performance level, I'm even more impressed. --- Statistics: Parse input file: multiple times Run time limit: 60 seconds Ran through file: 0 times Queries sent: 1982466 queries Queries completed:1957446 queries Queries lost: 25020 queries Queries delayed(?): 0 queries RTT max: 5.005290 sec RTT min: 0.03 sec RTT average: 0.061326 sec RTT std deviation:0.296004 sec RTT out of range: 10 queries Percentage completed: 98.74% Percentage lost:1.26% Started at: Mon May 17 07:48:36 2010 Finished at: Mon May 17 07:49:41 2010 Ran for: 65.16 seconds Queries per second: 30114.546433 qps -Original Message- From: pdns-users-boun...@mailman.powerdns.com [mailto:pdns-users-boun...@mailman.powerdns.com] On Behalf Of Lee Standen Sent: Monday, 17 May 2010 3:23 PM To: bert hubert Cc: pdns-users@mailman.powerdns.com Subject: Re: [Pdns-users] Acheiving 40,000 QPS Thanks for that information, Bert. I had seen the documentation before... perhaps I should provide some more information. Here are the options I'm using at the moment (I've tried several values): --- disable-packetcache=no local-address=0.0.0.0 local-port=53 max-cache-entries=400 max-packetcache-entries=400 single-socket=off threads=8 --- Here's the results of the second run using the same command line you had below... the data file I found using a quick google search for the filename you used: ./queryperf -q 1000 -l 100 < queryfile-example-3million --- Statistics: Parse input file: multiple times Run time limit: 100 seconds Ran through file: 0 times Queries sent: 1285008 queries Queries completed:1284175 queries Queries lost: 833 queries Queries delayed(?): 0 queries RTT max: 5.000198 sec RTT min: 0.02 sec RTT average: 0.074771 sec RTT std deviation:0.265890 sec RTT out of range: 1 queries Percentage completed: 99.94% Percentage lost:0.06% Started at: Mon May 17 07:15:32 2010 Finished at: Mon May 17 07:17:17 2010 Ran for: 104.875333 seconds Queries per second: 12244.776377 qps --- I just double-checked the hardware and I've actually got 4 cores available, not 8 as I initially thought: --- processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Xeon(R) CPU5150 @ 2.66GHz stepping: 6 cpu MHz : 2667.294 cache size : 4096 KB --- Lastly, I'm using the amd64 deb from the powerdns web site on Ubuntu 10.04 rather than building a new binary. It was assumed that those binaries would be optimized, but if they're not, I'm happy to try building it myself. Thanks in advance for any suggestions you might have :) -Original Message- From: bert hubert [mailto:bert.hub...@netherlabs.nl] Sent: Monday, 17 May 2010 2:31 PM To: Lee Standen Cc: pdns-users@mailman.powerdns.com Subject: Re: [Pdns-users] Acheiving 40,000 QPS Hi Lee, In the past few months, quite some CNS servers have been replaced by the PowerDNS Recursor, so you are not alone! The 40,000 number has been reproduced by a number of separate parties, sample output is below. First, please read http://doc.powerdns.com/recursor-performance.html especially the bit about firewalls. PowerDNS does aggressive source port randomization, and may stress out intervening firewalls. Second, try: dnsperf -q 1000 -l 100 < queryfile-example-3million I just did, and the output is: Parse input file: multiple times Run time limit: 100 seconds Ran through file: 0 times Queries sent: 2995336 queries Queries completed:2991690 queries Queries lost: 3646 queries Avg request size: 41 bytes Avg response size:80 bytes Percentage completed: 99.88% Percentage lost
Re: [Pdns-users] Acheiving 40,000 QPS
Thanks for that information, Bert. I had seen the documentation before... perhaps I should provide some more information. Here are the options I'm using at the moment (I've tried several values): --- disable-packetcache=no local-address=0.0.0.0 local-port=53 max-cache-entries=400 max-packetcache-entries=400 single-socket=off threads=8 --- Here's the results of the second run using the same command line you had below... the data file I found using a quick google search for the filename you used: ./queryperf -q 1000 -l 100 < queryfile-example-3million --- Statistics: Parse input file: multiple times Run time limit: 100 seconds Ran through file: 0 times Queries sent: 1285008 queries Queries completed:1284175 queries Queries lost: 833 queries Queries delayed(?): 0 queries RTT max: 5.000198 sec RTT min: 0.02 sec RTT average: 0.074771 sec RTT std deviation:0.265890 sec RTT out of range: 1 queries Percentage completed: 99.94% Percentage lost:0.06% Started at: Mon May 17 07:15:32 2010 Finished at: Mon May 17 07:17:17 2010 Ran for: 104.875333 seconds Queries per second: 12244.776377 qps --- I just double-checked the hardware and I've actually got 4 cores available, not 8 as I initially thought: --- processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Xeon(R) CPU5150 @ 2.66GHz stepping: 6 cpu MHz : 2667.294 cache size : 4096 KB --- Lastly, I'm using the amd64 deb from the powerdns web site on Ubuntu 10.04 rather than building a new binary. It was assumed that those binaries would be optimized, but if they're not, I'm happy to try building it myself. Thanks in advance for any suggestions you might have :) -Original Message- From: bert hubert [mailto:bert.hub...@netherlabs.nl] Sent: Monday, 17 May 2010 2:31 PM To: Lee Standen Cc: pdns-users@mailman.powerdns.com Subject: Re: [Pdns-users] Acheiving 40,000 QPS Hi Lee, In the past few months, quite some CNS servers have been replaced by the PowerDNS Recursor, so you are not alone! The 40,000 number has been reproduced by a number of separate parties, sample output is below. First, please read http://doc.powerdns.com/recursor-performance.html especially the bit about firewalls. PowerDNS does aggressive source port randomization, and may stress out intervening firewalls. Second, try: dnsperf -q 1000 -l 100 < queryfile-example-3million I just did, and the output is: Parse input file: multiple times Run time limit: 100 seconds Ran through file: 0 times Queries sent: 2995336 queries Queries completed:2991690 queries Queries lost: 3646 queries Avg request size: 41 bytes Avg response size:80 bytes Percentage completed: 99.88% Percentage lost:0.12% Started at: Mon May 17 08:23:12 2010 Finished at: Mon May 17 08:24:57 2010 Ran for: 104.828020 seconds Queries per second: 28539.029927 qps This is on a server with a firewall in place, and the first run. Second run with firewall state tracking disabled as per the instructions on doc.powerdns.com: Statistics: Parse input file: multiple times Run time limit: 100 seconds Ran through file: 1 times Queries sent: 5700362 queries Queries completed:5694333 queries Queries lost: 6029 queries Avg request size: 41 bytes Avg response size:80 bytes Percentage completed: 99.89% Percentage lost:0.11% Started at: Mon May 17 08:26:33 2010 Finished at: Mon May 17 08:28:18 2010 Ran for: 104.71 seconds Queries per second: 54381.363598 qps I hope this helps answer your question. The main trick is to have enough queries operating in parallel, which incidentally is a close match to 'real life' heavy use operation. The operating system of the numbers above is Ubuntu Karmic Koala. Let me know if you have further questions. Kind regards, Bert Hubert On Mon, May 17, 2010 at 01:45:46PM +0800, Lee Standen wrote: > Hi All, > > We're looking to trial PowerDNS as an option to replace our Nominum CNS > servers in the next few months, and we're impressed by the performance > claimed by PowerDNS. > > I've deployed a recursive server and have attempted to replay some captured > traffic, but based on
[Pdns-users] Acheiving 40,000 QPS
Hi All, We're looking to trial PowerDNS as an option to replace our Nominum CNS servers in the next few months, and we're impressed by the performance claimed by PowerDNS. I've deployed a recursive server and have attempted to replay some captured traffic, but based on my initial testing, I'm only able to pull about 2500 requests per second. Does any documentation exist which describes which settings must be changed to achieve the claimed 40,000 requests per second? The server is currently deployed on an IBM HS-21XM blade, which is an 8 core Xeon system. Thanks ___ Pdns-users mailing list Pdns-users@mailman.powerdns.com http://mailman.powerdns.com/mailman/listinfo/pdns-users
