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Spirent KB Article
Doc ID: FAQ18369
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Attero: Why do I see rate decrease and packet drop after setting delay on a Profile other than the Unfiltered Profile?
By default all memory is allocated to the Unfiltered Profile.
If the memory is not reallocated, the Filtered Profiles will have zero memory assigned.
If delay is set, the delay will be properly applied but to do this it will enter what is known as "Extended Delay Mode" and will start to drop packets.
The more memory allocated to the Filtered Profile, the lower the drops will be.
Or rather the rate that it can sustain will be higher.
The user guide touches upon this behavior.
It indicates that in Extended you can basically go to higher levels of delay without dropping packets but with the expense of max traffic rate.
It also gives a table with example delay and max rates.
One thing to understand is that the table is for when all 8M is allocated to that profile.
So with different memory allocations, your delay/max rate combinations will vary.
Product : Impairment,Attero