[Beignet] Kaby lake perf worse than Skylake?

[Yang, Rong R]

Hi,

    Is the quantity of infrared data they process same? Is it affected by fps?
    Has you try other method, such as the profiling time.
    Actually, in beignet, the Kabylake is almost same as Skylake.

> -----Original Message-----
> From: Beignet [mailto:beignet-bounces at lists.freedesktop.org] On Behalf Of
> Michael Gratton
> Sent: Thursday, July 20, 2017 8:49
> To: beignet at lists.freedesktop.org
> Subject: [Beignet] Kaby lake perf worse than Skylake?
> 
> Hi all,
> 
> I'm currently evaluating Beignet OpenCL performance on Skylake and Kaby
> Lake GPUs against Nvidia CUDA, and surprisingly found that for our specific
> task that the GPU performance when executing the same OpenCL algorithms
> was substantially worse on a Kaby lake HD630 than it was on a Skylake HD530.
> Is this to be expected?
> 
> The setup I am using is as follows:
>  - Ubuntu Xenial 16.04, kernel 4.8
>  - Beignet 1.3.0 compiled using the Zesty debian packaging on Xenial
>  - Intel i5-6500 (HD530) vs i7-7700 (HD630)
> 
> The OpenCL task is processing infrared data from Kinect 2 sensors, using the
> Protonect tool from the libfreenect2 library two different OpenCL-based
> algorithms: "default" and "kde" (the latter is more computationally intensive).
> 
> Measuring GPU utilisation using the "render busy" metric from
> intel_gpu_top, this is what I found:
> 
> HD530 utilisation:
>  - default: ~25%
>  - kde:     ~52%
> 
> HD630 utilisation:
>  - default: ~35%
>  - kde:     ~63%
> 
> I.e. the Kaby lake HD630 utilisation is 1.2-1.4 times heigher than the Skylake
> HD530, however I would have expected the exact opposite.
> 
> Upgrading the kernel to 4.10 produced only a minor improvement for the
> HD630. Would upgrading to Beignet 1.3.1 or a newer kernel than 4.10 help
> further at all? Any advice on how to substantially improve this kaby lake
> performance would be appreciated.
> 
> Cheers,
> //Mike
> 
> --
> ⊨ Michael Gratton, Percept Wrangler.
> ⚙ <http://mjog.vee.net/>
> 
> 
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