Hi,
The Kernel Timer change is only requested on the IMS bench SIPP systems, not on
the IMS core.
What are the consequences of keeping the Kernel Timer even on the IMS Bench
SIPP? If you stay with lower Kernel Timer Frequency, you should loose some
accuracy of the load generation. For instance, calls will potentially not be
generated every milliseconds, but every 4 milliseconds (HZ=250) or even worse
depending of the frequency you use. The statistical distribution is hence
affected. There is also a risk of bulk calls generation: instead for instance
of having one call every milliseconds, you would have 4 calls in one
millisecond, followed by no calls for 3 milliseconds. But that should be the
only consequences.
Ptp is used for two reasons:
- Between two IMS bench sipp servers. If I understand well your setup,
IMS bench sipp will run in your case on only one system, so there is no problem
here (even of you run 8 IMS bench sipp on this server, they will be
synchronized). If you had more than one server running IMS Bench SIPP, then
this is really mandatory, as the tool makes time differences between different
servers.
- To synchronize IMS bench sipp systems and SUT, for cpum (CPU
collection). If you lack ptp here, I think that only report might here be
affected (cpu graphs having the timing of your sut, while other graphs would
have timing of the IMS bench sipp systems).
So, the impact should not be too high in your configurations. But please note
this is not the configuration usually tested
-Xavier
________________________________
From: sougata pal [mailto:sougata....@gmail.com]
Sent: vendredi 15 octobre 2010 17:57
To: sipp-users@lists.sourceforge.net
Subject: [Sipp-users] Urgent Query on IMS Bench SIPp and OpenIMSCore
Hi All ,
I am having one query on installing IMS Bench SIPp.
Now my one desktop is having OpenIMSCore simulator and on the other one i am
installing IMS Bench SIPp.
Now when i see the pre-requisites for its installation , i see 2 things which i
want to get clear about -
1. Kernel Timer Frequency Changed to 1000 Hz
2. To install Precision Time protocol for having synchronization.
Now i want to know , is these 2 steps are mandatory? If i don't do these steps
will it effect my IMS Benchmark tests.
As my own desktop , which comprises of the OpenIMSCore simulator , does
changing its kernel timer frequency can hamper its present configurations?
If so , then i dont want to do it as i have everything installed in it till
today.
Also i want to know if anybody has done any tests on signaling load related
issues using IMS Bench SIPp and OpenIMSCore.
Regards ,
Sougata
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