[Pdns-users] Acheiving 40,000 QPS

Mon May 17 18:57:34 UTC 2010

Perf testing of 2/4/6/8 threads still shows optimal performance at 4
threads. Cache size of 3M, using test file of 3M addresses.

Tested on HP blades with quad-core X5570 CPU and 48GB RAM, 146GB 15k SAS
drives running on CentOS 5.x with a custom RPM.

2 threads:
new.2.1:  Maximum throughput:   40316.000000 qps
new.2.2:  Maximum throughput:   45260.000000 qps
new.2.3:  Maximum throughput:   51250.000000 qps
new.2.4:  Maximum throughput:   58752.000000 qps
new.2.5:  Maximum throughput:   63724.000000 qps

4 threads:
new.4.1:  Maximum throughput:   68176.000000 qps
new.4.2:  Maximum throughput:   85418.000000 qps
new.4.3:  Maximum throughput:   98502.000000 qps
new.4.4:  Maximum throughput:   97442.000000 qps
new.4.5:  Maximum throughput:   98750.000000 qps

6 threads:
new.6.1:  Maximum throughput:   85418.000000 qps
new.6.2:  Maximum throughput:   98660.000000 qps
new.6.3:  Maximum throughput:   96212.000000 qps
new.6.4:  Maximum throughput:   95466.000000 qps
new.6.5:  Maximum throughput:   96830.000000 qps

8 threads:
new.8.1:  Maximum throughput:   89584.000000 qps
new.8.2:  Maximum throughput:   96630.000000 qps
new.8.3:  Maximum throughput:   92082.000000 qps
new.8.4:  Maximum throughput:   93842.000000 qps
new.8.5:  Maximum throughput:   86078.000000 qps

FYI here is full output from the 'resperf' tool:

DNS Resolution Performance Testing Tool
Nominum Version 1.0.1.0

[Status] Sending
[Status] Waiting for more responses
[Status] Testing complete

Statistics:

  Queries sent:         2999999
  Queries completed:    2989899
  Queries lost:         10100
  Ran for:              100.000000 seconds
  Maximum throughput:   97442.000000 qps
  Lost at that point:   1.32%

 Brad

-----Original Message-----
From: pdns-users-bounces at mailman.powerdns.com
[mailto:pdns-users-bounces at mailman.powerdns.com] On Behalf Of Lee
Standen
Sent: Monday, May 17, 2010 12:57 AM
To: pdns-users at mailman.powerdns.com
Subject: 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:              0.000003 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:              65.000016 seconds

  Queries per second:   30114.546433 qps

-----Original Message-----
From: pdns-users-bounces at mailman.powerdns.com
[mailto:pdns-users-bounces at mailman.powerdns.com] On Behalf Of Lee
Standen
Sent: Monday, 17 May 2010 3:23 PM
To: bert hubert
Cc: pdns-users at 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=4000000
max-packetcache-entries=4000000
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:              0.000002 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) CPU            5150  @ 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.hubert at netherlabs.nl]
Sent: Monday, 17 May 2010 2:31 PM
To: Lee Standen
Cc: pdns-users at 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:              104.711111 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 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
> 
> 
> 

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