FFT co-processor benchmark

kenshow

Hi,

I would like to know the benchmark of FFT co-processor on C6670 except Wireless Infrastructure field. Does anyone check simple FFTc benchmark? That is 1024 points, 2048points and so on.

Thanks.

over 13 years ago

Chad Courtney over 13 years ago

TI__Mastermind 30825 points

Hi, we have a performance App Note that will be coming out shortly that has this information. I've gone ahead and dropped a snapshots of the FFTC performance numbers for your convenience.

Best Regards,

Chad

kenshow over 13 years ago in reply to Chad Courtney

Genius 3725 points

Hi Chad,

Thanks for good information. However, I couldn’t understand the meaning of the units in the table. Please let me know what these units mean and the relation.

Best regards,

Kenshow

Chad Courtney over 13 years ago in reply to kenshow

TI__Mastermind 30825 points

Kenshow,

The FFTC engine is highly pipelined and in order to get optimum performance out of it, there's an need to keep that pipe full. So to show the performance, our tests sends 20 packets (each packet has 3 blocks), a time stamp is taken after 10 packets have been processed and then again after 20 packets have been processed. Then the difference in the time between the 10 to 20 packets is taken and divide by 30 (10 packet difference * 3 FFT Blocks/Packet) to give the steady state time to compute one FFT block. The MSubc/s is the quantity in Millions of the number of points/sec that can be processed at that FFT/DFT size.

BTW, if this answers your question, please remember to mark the post as Verified.

Best Regards,

Chad

kenshow over 13 years ago in reply to Chad Courtney

Genius 3725 points

Thanks. Chad,

I am cleared the units and that the table shows best case of FFTc.

I have additional some questions as follows:

The test condition is DSP core at 1.2GHz and FFTc at 400MHz isn’t it?

Can you show me the worst case of FFTc benchmark? It means non pipe line usage case.

Best regards

Kenshow

Chad Courtney over 13 years ago in reply to kenshow

TI__Mastermind 30825 points

Kenshow,

Testing was with the DSP operating at 1GHz. I only have the data that was provided, which is the steady state performance.

Best Regards,

Chad

Xie qunfang over 13 years ago in reply to Chad Courtney

Prodigy 60 points

HI! chad,

Would you please give me some examples in which the program computes FFT(1200-point etc) using FFTC ? or where to find the instruction set of FFTC engine. I'd like to compute some FFTs, like 1152,1200 points.

Best Regards,

Qunfang Xie

Chen Neville54361 over 13 years ago in reply to Chad Courtney

Intellectual 315 points

Hi Chad,

Is this application note released? Could you please let me know the link? Thanks a lot.

Best regards,

Neville Chen

Chad Courtney over 13 years ago in reply to Chen Neville54361

TI__Mastermind 30825 points

Neville,

Yes, it's released. There should be a link on the device page, but here's a direct link SPRABK5.

Best Regards,

Chad

Chen Neville54361 over 13 years ago in reply to Chad Courtney

Intellectual 315 points

Thanks Chad. Is there any source codes associated with this application note? Are they public to customers? If so, could you please let me know the link as well. Thanks a lot.

Best regards,

Neville Chen

Derek Brown over 13 years ago in reply to Chen Neville54361

TI__Intellectual 1880 points

Neville,

Currently, there is no source code to accompany this application note. We realize that source code would be very beneficial for this document, and may provide example code in the future. There is example code for FFTC provided with the MCSDK, however, it is not optimized for performance.

Regards,

Derek

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FFT co-processor benchmark