[Libva] Can we expect better GPU performance on braswell(Intel celeron N3160) than baytrail(Intel celeron J1900)?

[Peter Frühberger]

Something I have forgotten,

On Thu, Dec 15, 2016 at 8:14 PM, Peter Frühberger <fritsch at kodi.tv> wrote:

> Hi Veeranna,
>
> On Thu, Dec 15, 2016 at 6:03 PM, ViruS Tadala <
> tadala.veerannababu at gmail.com> wrote:
>
>> Hi Peter,
>>
>> Thanks for your quick response.
>>
>> Mentioned figures are GPU load values. I have ran the intel_gpu_top
>> command to get the same.
>>
>> I didn't check any clock details. Used below pipeline and ran multiple
>> instances.
>>
>> gst-launch-1.0 videotestsrc is-live=true pattern=22 horizontal-speed=20 !
>> 'video/x-raw, format=(string)I420, width=(int)1920, height=(int)1080,
>> framerate=(fraction)10/1' ! vaapiencode_h264 min-qp=20 ! queue !
>> vaapidecode ! queue ! appsink
>>
>> Please let me know if you need more information.
>>
>> Best Regards,
>> Veeranna.
>>
>>
>>
>> On Thu, Dec 15, 2016 at 11:47 AM, Peter Frühberger <fritsch at kodi.tv>
>> wrote:
>>
>>> Hi Veeranna,
>>>
>>> i cannot even interpret your figures. Is that the CPU load? If yes - did
>>> you check the clocks?
>>> Which benchmark did you use? Where did the data come from, where was it
>>> encoded to? Was it stored? Which format?
>>>
>>> In short: Without more details you most likely get the following answer:
>>>
>>> Depends!
>>>
>>> Best regards
>>> Peter
>>>
>>> On Thu, Dec 15, 2016 at 4:19 PM, ViruS Tadala <
>>> tadala.veerannababu at gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> I have done some benchmarking on both platforms & observed that
>>>> braswell did lesser number of channels(decode + re-encode using vaapi) than
>>>> baytrail.
>>>>
>>>> 60-65% for 6channels on braswell.
>>>>
>>>> 60-66 % for 10channels on baytrail.
>>>>
>>>> Please let me know whether we can expect better GPU performance on
>>>> braswell than baytrail or not?
>>>>
>>>> Best Regards,
>>>>
>>>> Veeranna.
>>>>
>>>> _______________________________________________
>>>> Libva mailing list
>>>> Libva at lists.freedesktop.org
>>>> https://lists.freedesktop.org/mailman/listinfo/libva
>>>>
>>>>
>>>
>>
>>
>> --
>> Best Regards,
>> ViruS
>>
>
> Does this kernel patch help:
>
>
> From 32c513eeafa681f798b04488524994fe47355cad Mon Sep 17 00:00:00 2001
> From: fritsch <peter.fruehberger at gmail.com>
> Date: Sat, 13 Aug 2016 22:56:37 +0200
> Subject: [PATCH] drm/i915: intel-pm enable thresholds
>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 06e5596..38e613c 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4982,8 +4982,7 @@ static void valleyview_set_rps(struct drm_i915_private *dev_priv, u8 val)
>
>  	if (val != dev_priv->rps.cur_freq) {
>  		vlv_punit_write(dev_priv, PUNIT_REG_GPU_FREQ_REQ, val);
> -		if (!IS_CHERRYVIEW(dev_priv))
> -			gen6_set_rps_thresholds(dev_priv, val);
> +		gen6_set_rps_thresholds(dev_priv, val);
>  	}
>
>  	dev_priv->rps.cur_freq = val;
> --
> 2.7.4
>
>
>
> Best regards
>
> Peter
>
>
And also check this: /sys/class/drm/card0/gt_min_freq_mhz while
benchmarking, it might simply be that the gpu is not clocking correctly.
You can increase the min clock by doing:  echo 600 >
/sys/class/drm/card0/gt_min_freq_mhz
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