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TDA4VE-Q1: High IO wait and PVR log

Xingyu Zhu
Expert 4325 points
Part Number: TDA4VE-Q1

Tool/software:

Hi expert,

Our customer using TDA4VE is observing high “IO Wait” on the system. After checking the dmesg logs, they found that PVR log are printed at the same time when high IO Wait occurs.

Could you please help to check if there is a correlation between the high IO Wait and the PVR log? We are suspecting GPU operations are causing to IO Wait. Thank you

dmesg_0610.txt

Best Regards,

Xingyu Zhu

  • 0
    Intellectual 545 points

    Another question is that after multiple tests, I found that this type of log sometimes appears and sometimes does not appear. Why is it a probabilistic event? Is there any problem with this?

  • 0 in reply to Gaston yan
    TI__Guru** 112315 points

    Hi Xingyu.,

    Our GPU expert is currently on vacation. Please expect a delayed response on this thread.

    Xingyu Zhu said:
    Could you please help to check if there is a correlation between the high IO Wait and the PVR log? We are suspecting GPU operations are causing to IO Wait.

    In general, these should be unrelated. I see this during boot-log, I suspect an issue with one of the offending peripherals. You may want to retry the boot by not loading the GPU module (either blacklist the module in your rootfs, or rename the kernel module name).

    What are you running in your file-system that is exercising GPU during the boot?

    In anycase, this may not be a GPU issue.

    regards

    Suman

  • 0 in reply to Suman Anna
    Intellectual 545 points

    Hi : 

                  The printed log is in the pvr driver. If you don't load this ko file, there will definitely be no log.

  • 0 in reply to Gaston yan
    TI__Genius 16800 points

    Hi Gaston, 

    Apologies for the delay, I was out of office and catching up on several topics. What SDK and version are you using? Are you using the default filesystem or have you made changes? 

    Before we assess, could you go through this FAQ and provide the necessary logs and information to analyze the GPU (FAQ).

    Thanks,
    Sarabesh S.