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How to measure FFTC Throughput?

I'm trying to understand FFT core processor in c66xx. In my case I want to know on how many samples it can perform fft per second.
Actually I want to reproduce the results in  sprabh2a (Throughput Performance Guide for TCI66xx ) page 20,21. 

I  ran FFT multicore example((ti\pdk_keystone2_3_01_04_07\packages\ti\drv\fftc)), but when I try to send more than one packet by changing "NUM_PACKETS", It gave me following error (only part is shown) 

[C66xx_1] [Core 1]: Rx flow 1 opened successfully using Rx queue 713
[C66xx_2] [Core 2]: Rx flow 2 opened successfully using Rx queue 714
[C66xx_3] [Core 3]: Rx flow 3 opened successfully using Rx queue 715
[C66xx_0] [Core 0]: Unable to get request buffer
[C66xx_1] [Core 1]: Unable to get request buffer
[C66xx_2] [Core 2]: Unable to get request buffer
[C66xx_0] [Core 0]: Waiting for other cores to finish ...

How to fix this error and measure throughput(in Mega samples per seconds)?

Thank you,

I'm using ccs v6 and my device is tci6630 keystone 2