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;
> };
>
>
>
>
>