Bug 51436 - [SNB regression]Piglit general/clear-varray-2.0 randomly fails
Summary: [SNB regression]Piglit general/clear-varray-2.0 randomly fails
Status: CLOSED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: unspecified
Hardware: All Linux (All)
: medium normal
Assignee: Daniel Vetter
QA Contact:
URL:
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Depends on:
Blocks:
 
Reported: 2012-06-26 00:16 UTC by lu hua
Modified: 2017-10-06 14:49 UTC (History)
5 users (show)

See Also:
i915 platform:
i915 features:

Attachments
add CS_STALL to render cache flush (2.50 KB, patch)
2012-06-26 03:42 UTC, Daniel Vetter 		no flags Details | Splinter Review
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Description lu hua 2012-06-26 00:16:05 UTC 
System Environment:
--------------------------
Arch:        i386
Platform:    Sandybridge
Libdrm:      (master)libdrm-2.4.35-12-gae137f4669ccdbc615d18facebdb804a9af9846b
Mesa:        (master)37d699a296ac1d63b9276224847df4b645b53fe2
Xserver:     (master)xorg-server-1.12.0-239-g3ef3ce069d52dcfa932c90ccd30854a8d9daa15a
Xf86_video_intel:(master)2.19.0-334-gfa10005ce31483827547b7f71eae066899f0026c
Libva:       (staging)f12f80371fb534e6bbf248586b3c17c298a31f4e
Libva_intel_driver:(staging)82fa52510a37ab645daaa3bb7091ff5096a20d0b
Kernel:    (drm-intel-next-queued) ff049b6ce21d2814451afd4a116d001712e0116b

Bug detailed description:
-----------------------------
It fails 3 times in 10 runs on Sandybridge with drm-intel-next-queued kernel.It doesn't happen on  drm-intel-fixes kernel.

output:
Probe at (30,30)
  Expected: 0.000000 1.000000 0.000000
  Observed: 1.000000 0.000000 0.000000
PIGLIT: {'result': 'fail' }

Reproduce steps:
----------------------------
1. start X
2. ./bin/clear-varray-2.0 -auto
Comment 1 Daniel Vetter 2012-06-26 02:25:13 UTC 
I've bisected the glean regress (bug #51429= to

commit cc889e0f6ce6a63c62db17d702ecfed86d58083f
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Jun 13 20:45:19 2012 +0200

    drm/i915: disable flushing_list/gpu_write_list

Can you please check whether this is the root-cause behind this issue here, too? Easiest is probably to just revert cc889e0f6ce6a63c6
Comment 2 Daniel Vetter 2012-06-26 03:42:41 UTC 
Created attachment 63483 [details] [review]
add CS_STALL to render cache flush

Separately from testing the revert, please also test this patch here.
Comment 3 lu hua 2012-06-26 23:10:12 UTC 
Add CS_STALL patch, this issue still exists.

Revert commit cc889e0f6ce6, this issue goes away.
Comment 4 lu hua 2012-06-28 00:21:34 UTC 
Retest this on the queued kernel (commit:3e52259264832dc8c) with SC_STALL patch.
Issue goes away.
Comment 5 Daniel Vetter 2012-06-28 12:07:38 UTC 
Patch merged to -queued as

commit 97f209bcfc0c5db08d9badf8cbafd489f22a6e44
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Thu Jun 28 09:48:42 2012 +0200

    drm/i915: "Flush Me Harder" required on gen6+
Comment 6 lu hua 2012-07-01 23:49:29 UTC 
Verified.It has been fixed on drm-intel-next-queued kernel(commit 146937e5828ede495e11ba3a6f4a01b36b7166dc)
Comment 7 Elizabeth 2017-10-06 14:49:27 UTC 
Closing old verified.

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