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Performance degradation after update from 2017R3 to 2018R1

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Hi, 

We've encounter performance degradation after update from 2017R3 to 2018R1 Intel Media SDK community edition for Linux on Intel(R) Xeon(R) CPU E3-1585L v5 @ 3.00GHz

After update the overall performance decreases up to 25% and now our server can handle less streams then before update (we use only AVC as codec)

What we can see as difference, that on 2017R3 metrics_monitor shows us VIDEO2 module and load on it:

RENDER usage: 90.00,	VIDEO usage: 36.00,	VIDEO_E usage: 68.00	VIDEO2 usage: 45.00	GT Freq: 1100.00
RENDER usage: 79.00,	VIDEO usage: 21.00,	VIDEO_E usage: 53.00	VIDEO2 usage: 45.00	GT Freq: 1100.00
RENDER usage: 82.00,	VIDEO usage: 32.00,	VIDEO_E usage: 58.00	VIDEO2 usage: 43.00	GT Freq: 1100.00
RENDER usage: 92.00,	VIDEO usage: 26.00,	VIDEO_E usage: 72.00	VIDEO2 usage: 48.00	GT Freq: 1100.00
RENDER usage: 83.00,	VIDEO usage: 21.00,	VIDEO_E usage: 63.00	VIDEO2 usage: 49.00	GT Freq: 1100.00
RENDER usage: 79.00,	VIDEO usage: 24.00,	VIDEO_E usage: 61.00	VIDEO2 usage: 38.00	GT Freq: 1100.00

but after update, on 2018R1 we can't see VIDEO2 and RENDER module always 100% load:

RENDER usage: 100.00,	VIDEO usage: 49.00,	VIDEO_E usage: 73.00	GT Freq: 1100.00
RENDER usage: 100.00,	VIDEO usage: 41.00,	VIDEO_E usage: 70.00	GT Freq: 1100.00
RENDER usage: 100.00,	VIDEO usage: 47.00,	VIDEO_E usage: 73.00	GT Freq: 1100.00
RENDER usage: 100.00,	VIDEO usage: 47.00,	VIDEO_E usage: 71.00	GT Freq: 1100.00
RENDER usage: 100.00,	VIDEO usage: 45.00,	VIDEO_E usage: 75.00	GT Freq: 1100.00
RENDER usage: 99.00,	VIDEO usage: 42.00,	VIDEO_E usage: 74.00	GT Freq: 1050.00
RENDER usage: 100.00,	VIDEO usage: 38.00,	VIDEO_E usage: 71.00	GT Freq: 1050.00

Also you may notice that GT Freq has small fluctuations that we also don't observe on 2017R3

Dmesg initialization log seems the same for both SDK versions:

[Mon Dec 24 12:49:26 2018] [drm] Initialized drm 1.1.0 20060810
[Mon Dec 24 12:49:26 2018] [drm] Found 128MB of eLLC
[Mon Dec 24 12:49:26 2018] [drm] Memory usable by graphics device = 4096M
[Mon Dec 24 12:49:26 2018] [drm] Replacing VGA console driver
[Mon Dec 24 12:49:26 2018] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[Mon Dec 24 12:49:26 2018] [drm] Driver supports precise vblank timestamp query.
[Mon Dec 24 12:49:27 2018] [drm] failed to retrieve link info, disabling eDP
[Mon Dec 24 12:49:27 2018] [drm] RC6 disabled, disabling runtime PM support
[Mon Dec 24 12:49:27 2018] [drm] Initialized i915 1.6.0 20151010 for 0000:00:02.0 on minor 0
[Mon Dec 24 12:49:27 2018] [drm] Cannot find any crtc or sizes - going 1024x768
[Mon Dec 24 12:49:27 2018] i915 0000:00:02.0: fb1: inteldrmfb frame buffer device
[Mon Dec 24 12:49:28 2018] [drm] RC6 off
[Mon Dec 24 12:49:28 2018] [drm] The Ring/GT multiplier is 2

What can we do? How to debug this problem? Why that can be? 


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