Bind performance as caching nameserver

[Kevin Darcy]

Why do you have a recursive-clients limit of 1500 if the point is to 
push your box to the breaking point?

- Kevin

Ulrich David wrote:
> Hi,
>
> I'm testing some configuration for my caching name server with Bind  
> 9.4.2-P2 using resperf. The server is a dual Core Xeon at 2,3GHz 2GB  
> Ram runing gentoo linux. The goal is to have maximum performance from  
> this box.
>
> The problem is I don't know which performance I can expect of, in term  
> of latency and in term of response per second (without or with loss).
>
> Here is my results :
> Statistics:
>
>    Queries sent:         187367
>    Queries completed:    136574
>    Queries lost:         50793
>    Ran for:              54.994721 seconds
>    Maximum throughput:   15492.000000 qps
>    Lost at that point:   9.31%
>
> # time target_qps actual_qps responses_per_sec failures_per_sec  
> avg_latency
>    0.250   416.67   416.00   416.00     2.00 0.007470
>    0.750  1250.00  1250.00  1250.00    18.00 0.010431
>    1.250  2083.33  2082.00  2082.00    40.00 0.004323
>    1.750  2916.67  2918.00  2918.00   290.00 0.186844
>    2.250  3750.00  3750.00  3750.00  2186.00 2.234745
>    2.750  4583.33  4582.00  4582.00  1668.00 2.879924
>    3.250  5416.67  5418.00  5418.00  1260.00 1.817618
>    3.750  6250.00  6250.00  6250.00  2864.00 4.013023
>    4.250  7083.33  7082.00  7082.00  1760.00 1.853761
>    4.750  7916.67  7918.00  7918.00  2450.00 2.763024
>    5.250  8750.00  8750.00  8750.00  4146.00 3.793698
>    5.750  9583.33  9582.00  9582.00  3522.00 2.775299
>    6.250 10416.67 10418.00 10418.00  3796.00 2.814351
>    6.750 11250.00 11250.00 11250.00  4872.00 3.234263
>    7.250 12083.33 12082.00 12082.00  4454.00 2.876617
>    7.750 12916.67 12918.00 12918.00  6312.00 3.520631
>    8.250 13750.00 13750.00 13750.00  6200.00 3.318447
>    8.750 14583.33 14582.00 14582.00  4192.00 2.017755
>    9.250 15416.67 15418.00 15418.00  4278.00 1.928234
>    9.750 16250.00 16250.00 13854.00  4998.00 2.440862
>   10.250 17083.33 17082.00 15492.00  6544.00 2.837576
>   10.750 17916.67 17918.00 12032.00  4430.00 2.467845
>   11.250 18750.00 18750.00 13120.00  4354.00 2.217802
>   11.750 19583.33 19582.00 15038.00  4810.00 2.081687
>   12.250 20416.67 20418.00 10182.00  3070.00 1.983601
>   12.750 21250.00 21250.00  8074.00  2832.00 2.224380
>   13.250 22083.33 22082.00  9254.00  2834.00 1.906686
>   13.750 22916.67 22918.00  8896.00  2326.00 1.752326
>   14.250 23750.00 23750.00  8964.00  2992.00 2.003389
>
> I'm quite surprised by the failures and by the average latency for  
> more than 1500 qps...
>
> Are these results realistic for this hardware configuration or have I  
> miss something in my config file?
>
> query logging is OFF and my options are :
> options {
> 	directory "/var/bind";
> 	pid-file "/var/run/named/named.pid";
> 	statistics-file "/var/bind/stats/named.stats";
>
> 	listen-on-v6 { none; };
>          listen-on { myself; };
>
> 	version	"None of your business";
> 	allow-query { trusted_network; };
> 	blackhole { blacklist; };
> 	max-cache-size 0;
> 	recursive-clients 1500;
> };
>
>
>
>
>