Performance measurement for DSP

Yogesh Tyagi

I am working on DSPC8681E (Advantech board) to measure the DSP performance for audio transcoding. the DSP card is plugged-in to the host machine via PCI slot. I am using Demo app (ipc) for audio transcoding which sends 80 samples of input data to DSP via PCI. The transcoding time for whole audio file, as we measure from host application, comes in milliseconds using clock() function(7 milliseconds to be precise) whereas it should come in microseconds.

So, we decided to calcute the transcoing time from DSP Interrupt service routine duration(on DSP side) but we don't know how to calculate ISR duration.

We also tried to enable prints in ISR, but after this the execution hangs.

Please help us in calculating frame time using any available register in DSP ISR or any other mechanism to calculate frame processing time. We have also tried to access UART and LAN ports on DSP for direct access to DSP but no luck. Please share with us any document to configure UART/LAN port on DSP.

Thanks,

Yogesh

over 9 years ago

0 Cvetolin Shulev-XID over 9 years ago

TI__Guru 65405 points

Hi Yogesh,

What SDK is running on your board?

BR
Tsvetolin Shulev

0 Yogesh Tyagi over 9 years ago in reply to Cvetolin Shulev-XID

Prodigy 30 points

Hi Tsvetolin Shulev,

We are not using any SDK but we are using CCS (Code Composer Studio) development environment and PDK C6678_1_1_2_6. There is one "Lightning_PCIE_0_7" package which includes PCI driver, dsp loader utility and some sample applications. One of those sample applications, is "ipc" which we are using for audio transcoding performace verification.

We are using "demo_evmc6678l" project provided by Advantech which includes DSP codecs,ISR . We build the project demo_evmc6678l using CCS and load DSP codes's hex file using dsp loader utility. This program loaded on DSP receives data from "ipc" sample app over PCI bus from host and performs audio transcoding(By passing data to DSPs).

Thanks,

Yogesh

0 Cvetolin Shulev-XID over 9 years ago in reply to Yogesh Tyagi

TI__Guru 65405 points

Yogesh,

Here are guides about UART and ethernt. See Initialization sections:
www.ti.com/.../sprugp1.pdf
www.ti.com/.../sprugv9d.pdf
For further support I've forwarded this to the c667x experts. Their feedback should be posted here.

BR
Tsvetolin Shulev

0 Todd Anderson78572 over 9 years ago in reply to Cvetolin Shulev-XID

Guru 14640 points

Instead of enabling prints in your ISR, can you use a spare I/O that can be turned on at entry and turned off at exit?
That way you can use an external logic analyzer or oscilloscope to measure time spent, and how often the ISR is entered and exited.
Then you can maybe narrow down what is taking the most time during the ISR...

Hopefully, that helps.

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Performance measurement for DSP