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Antwort: Re: [hobbit] bbtest shows long DNS runtime, why
- To: hobbit (at) hswn.dk
- Subject: Antwort: Re: [hobbit] bbtest shows long DNS runtime, why
- From: thorsten.erdmann (at) daimler.com
- Date: Fri, 12 Sep 2008 17:04:06 +0200
Thank you for the very quick answer! The testip tag did the trick. Now I
again have a near-zero-line for the bbtest runtime.
Thorsten Erdmann
ITI/EP68
Mercedes Benz Werk Hamburg
Tel.: +49-40-7920-2593
mobil: +49-160-8614383
Lotus-Fax:+49-711-1779043874
mail: thorsten.erdmann (at) daimler.com
josh (at) imaginenetworksllc.com
12.09.2008 15:43
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Re: [hobbit] bbtest shows long DNS runtime, why
It seems that hobbit resolves all clients via DNS:
# hostnames resolved : 40
Why that, I gave all names and it's corresponding IPs at the bb-hosts
file?
www.google.com 208.69.36.230 # <-- this will lookup www.google.com and
ping the IP, if it can't find an A record for it then it will use the IP
as a backup
www.google.com 208.69.36.230 # testip <--- this will use the hostname
for display purposes, no dns lookup and skip to using the IP for the conn
test
I have the same triangular graphs on hotspot networks with multiple APs.
This is normal, as far as I can tell.
Adding 400 hosts and 400 dns queries shouldn't cause too much of a load,
though, if you're worried about the DNS queries taking out the DNS servers
then just tack "testip" to the end of them. The conn/ping test is awfully
efficient, assuming you're using fping.
Are you using fping or hobbitping?
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
Those who don't understand UNIX are condemned to reinvent it, poorly.
--- Henry Spencer
On Fri, Sep 12, 2008 at 9:38 AM, <thorsten.erdmann (at) daimler.com> wrote:
Hi
I am running hobbit against 40 clients. Two of these clients are our DNS
servers. Only on these two clients I have enabled the DNS test by adding
the DNS keyword to their bb-hosts line. I wanted to check the function of
the DNS servers
If I look at the statistics of bbtest it looks like this:
Fri Sep 12 15:26:08 2008
bbtest-net version 4.2.0
SSL library : OpenSSL 0.9.7a Feb 19 2003
LDAP library: OpenLDAP 20213
Statistics:
Hosts total : 41
Hosts with no tests : 1
Total test count : 44
Status messages : 45
Alert status msgs : 0
Transmissions : 2
DNS statistics:
# hostnames resolved : 40
# succesful : 40
# failed : 0
# calls to dnsresolve : 44
TCP test statistics:
# TCP tests total : 2
# HTTP tests : 1
# Simple TCP tests : 1
# Connection attempts : 2
# bytes written : 126
# bytes read : 871
TIME SPENT
Event Starttime Duration
bbtest-net startup 1221225968.275331 -
Service definitions loaded 1221225968.276931 0.001600
Tests loaded 1221225968.281365 0.004434
DNS lookups completed 1221225973.283037 5.001672
Test engine setup completed 1221225973.285332 0.002295
TCP tests completed 1221225973.286398 0.001066
PING test completed (40 hosts) 1221225974.166549 0.880151
PING test results sent 1221225974.177932 0.011383
Test result collection completed 1221225974.177943 0.000011
LDAP test engine setup completed 1221225974.177944 0.000001
LDAP tests executed 1221225974.177945 0.000001
LDAP tests result collection completed 1221225974.177946 0.000001
NSLOOKUP tests executed 1221225974.179452 0.001506
Test results transmitted 1221225974.181039 0.001587
bbtest-net completed 1221225974.182936 0.001897
TIME TOTAL 5.907605
What you see are two mystic things:
It seems that hobbit resolves all clients via DNS:
# hostnames resolved : 40
Why that, I gave all names and it's corresponding IPs at the bb-hosts
file?
The DNS test runs about 5 seconds for only these 40 clients, maybe that is
because of the first issue:
DNS lookups completed 1221225973.283037 5.001672
If you look at the graph, it gives very scary "triagle curves". I've put a
screenshot here: http://www.trektech.de/test/hobbitgraph.png
The thing seems to have started when I put the DNS keyword to my two DNS
servers. Before it gave a nearly zero line.
I want to add about 400 network switches which should only do a ping test
and I fear that this would extremely increase the runtime of the bbtest.
What can I do to decrease the runtime?
Thorsten Erdmann
ITI/EP68
Mercedes Benz Werk Hamburg
Tel.: +49-40-7920-2593
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