Bug 106885 - [CI] igt@kms_plane@pixel-format-pipe-[abc]-planes - dmesg-warn - *ERROR* Overflow of CRC buffer, userspace reads too slow.
Summary: [CI] igt@kms_plane@pixel-format-pipe-[abc]-planes - dmesg-warn - *ERROR* Over...
Status: NEW
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: XOrg git
Hardware: Other All
: high normal
Assignee: Maarten Lankhorst
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard: ReadyForDev
Keywords:
Depends on:
Blocks:
 
Reported: 2018-06-11 13:06 UTC by Martin Peres
Modified: 2018-12-09 19:42 UTC (History)
3 users (show)

See Also:
i915 platform: BSW/CHT, CNL, GLK, KBL, SKL
i915 features: display/Other


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Comment 3 Martin Peres 2018-09-21 14:38:11 UTC
https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_115/fi-skl-caroline/igt@kms_plane@pixel-format-pipe-b-planes.html

<3> [306.918597] [drm:drm_crtc_add_crc_entry] *ERROR* Overflow of CRC buffer, userspace reads too slow.
Comment 4 Jani Saarinen 2018-11-07 12:20:46 UTC
Not seen on ICL lately?
Comment 5 Martin Peres 2018-11-07 13:00:42 UTC
(In reply to Jani Saarinen from comment #4)
> Not seen on ICL lately?

Last seen in https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_117/fi-icl-u/igt@kms_plane@pixel-format-pipe-a-planes.html, after being seen every single drmtip run after drmtip_95 (introduction of ICL).

I guess this is sufficient to say that ICL is fixed.
Comment 6 Mika Kahola 2018-11-30 09:35:01 UTC
If this error is not seen regularly, maybe we could pump up a bit the size of a ringbuffer. Now, we have DRM_CRC_ENTRIES_NR defined as 128, so maybe we could increase it to 256?
Comment 7 Martin Peres 2018-11-30 13:13:02 UTC
(In reply to Mika Kahola from comment #6)
> If this error is not seen regularly, maybe we could pump up a bit the size
> of a ringbuffer. Now, we have DRM_CRC_ENTRIES_NR defined as 128, so maybe we
> could increase it to 256?

Are the CRCs per pipe or global? If it is per-pipe, then 128 CRCs @ 60 Hz is more than 2 seconds of not reading the crc... I would think that this ought to be sufficient and if it is not, we really need to look into why we have such latency in the userspace, don't you think? :o


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