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Streamline bandwidth stats on ARM Mali Midgard (T6xx- T7xx)

sid

My experiment machines are Note 3 and Note 4.

I have a free edition of DS-5 Version-20

I have couple of questions with regards to GPU BandWidth stats reported by Streamline -

-  On T628 (Note3) Read and Write BEATs reported on a simple app seem to be 66% of expected value. Is this a known bug on bandwidth PMs on T6xx?

   My test app reads in randomly generated texture and draws it on the screen - since every frame is a new/random texture there is no Transaction elimination in play.

- I tried the same experiment on Note 4 - but Rd/Wr BEATs and many other stats stay blank (report Zero) on this T7xx system. Is this a known issue? are these stats not available on T7xx Mali arch OR is this something to do with using free version of DS-5?

Thanks !

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  • 0 Arm Employee Badge in reply to sid

    > Could you clarify if you meant that T7xx PMs are not supported on this custom built kernel?

    Correct - the gator/mali driver integration in the current Note 4 kernel does not support Mali-T760 counters.

    Both of the issues you have hit - support for more than 4 cores and support for the Mali-T700 family - are supported in our final r5p0 driver release.

    > Is there any plan to release an open-source driver with PM support in future?

    The stock r5p0 kernel drivers for the Mali-T700 series GPUs is available at the link below, but are not much use without the matching user-space drivers:

        Mali Drivers

    The full kernel tree linked in the guide is provided via Samsung, not directly from ARM, so this is a question best aimed in their direction (we do provide driver binaries for a couple of developer-friendly platforms, but the Note 4 is not one of these). Note you will need both the r5p0 kernel and the r5p0 user-space drivers.

    HTH,

    Pete

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  • 0 Arm Employee Badge in reply to sid

    > Could you clarify if you meant that T7xx PMs are not supported on this custom built kernel?

    Correct - the gator/mali driver integration in the current Note 4 kernel does not support Mali-T760 counters.

    Both of the issues you have hit - support for more than 4 cores and support for the Mali-T700 family - are supported in our final r5p0 driver release.

    > Is there any plan to release an open-source driver with PM support in future?

    The stock r5p0 kernel drivers for the Mali-T700 series GPUs is available at the link below, but are not much use without the matching user-space drivers:

        Mali Drivers

    The full kernel tree linked in the guide is provided via Samsung, not directly from ARM, so this is a question best aimed in their direction (we do provide driver binaries for a couple of developer-friendly platforms, but the Note 4 is not one of these). Note you will need both the r5p0 kernel and the r5p0 user-space drivers.

    HTH,

    Pete

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