Issues with tput_Benchmarking example project for B-S-B confguration

Deepankar Debnath

Hi All,

We have a custom pcb board with DSPs and srio switch(cps-1616). We changed some configurations(speed = 2.5Gbps, lane = 1x four lanes, ref_Clk=156.25MHz) according to our requirements. We first checked tput_benchmark_project in loopback mode in all DSPs and it worked fine. Now while running this program for B-S-B configuration, we noticed that only NWRITE tests are passing and after that switch port goes in error state(Ack misalignment error). We can remove this error by resetting the switch but again we have to run program on DSPs and again error occurs at start of NREAD tests.

We tried to run above program for NWRITE tests only and it worked perfectly(configuration B-S-B) but as soon as we are running this program for "srio_nwrite_nread_test", it passes nwrite tests but couldn't start nread tests and we observed that switch shows "Ack misalignment" error.

We also tried to run only "srio_nread_tests" but same thing occurs, before test starts, switch port shows input error.

We also observed that as packet size increases beyond 128Bytes, it takes a long time to go to next iteration i.e. packet size 256Bytes. Can anyone inform us why this is happening? Is there any way to reduce time consumption during high packet sizes(above 128Bytes)?

Thanks

Deepankar Debnath

over 10 years ago

0 Ganapathi Dhandapani95 over 10 years ago

TI__Mastermind 28085 points

Hi,

Have you referred the "SRIO Benchmarking Example Code User’s Guide" document for your testing?

Have you using TI provide SRIO_Throughput example code?

Refer section "2.3.16 Optimization Techniques" on SRIO user guide(SPRUGW1B) for packet size related clarification.

Thanks,

0 Deepankar Debnath over 10 years ago in reply to Ganapathi Dhandapani95

Prodigy 110 points

Hi,

Thanks for your reply.

Yes, we referred to "SRIO Benchmarking Example Code User’s Guide" for our testing and
made changes for different configuration as mentioned in the guide.

We are using TI's Tput_Benchmarking example code.

The problem is after passing, easily and every time for NWRITE tests, it failing to
start NREAD tests when two DSP's are connected through switch. But both tests are
passing in loopback mode.
With Regards,
Deepankar Debnath

0 Ganapathi Dhandapani95 over 10 years ago in reply to Deepankar Debnath

TI__Mastermind 28085 points

Hi,

Thanks for your information.

NWRITE and NREAD tests are passing in loopback mode, it internal or external loopback. If you tested internal loopback mode means, please try to test Single EVM looped back externally using an external SRIO switch.

I am not have SRIO switch to reproduce your issue. But I have tested two EVMs connected using breakout cards, it is working fine.

Thanks,

0 Deepankar Debnath over 10 years ago in reply to Ganapathi Dhandapani95

Prodigy 110 points

Hi,

I tried to test NREAD through C-S-C(core0 to core1 within same DSP, through switch) configuration and it worked fine. Only when we are trying to communicate between two different DSPs, NREAD test is not passing. All other tests are passing fine.

Regards,

Deepankar Debnath

0 Ganapathi Dhandapani95 over 10 years ago in reply to Deepankar Debnath

TI__Mastermind 28085 points

Hi,

The C-S-C connection mode (core to core, with a SRIO switch) is working fine means the B-S-B connection mode (board to board, with a SRIO switch) also work properly. I am not sure what is the problem on your setup.

Have you tested the C-S-C connection mode on both DSPs? Both are working fine.

Thanks,

0 Deepankar Debnath over 10 years ago in reply to Ganapathi Dhandapani95

Prodigy 110 points

Hi,
Actually C-S-C is not working on 2nd DSP. Infact there are four DSPs connected to srio switch but none of them, except DSP0, is able to run NREAD test in C-S-C configuration. So is it a configuration issue?
Thanks,
With Regards,
Deepankar

0 Ganapathi Dhandapani95 over 10 years ago in reply to Deepankar Debnath

TI__Mastermind 28085 points

Hi,

In your setup one DSP is works properly and other DSP are not working means, the problem on SRIO switch configuration. But i don't know the exact problem, I am not have that much experience on SRIO switch.

Thanks,

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Issues with tput_Benchmarking example project for B-S-B confguration