Bug 109682

Summary: [BDWgt3e] intermittent deqp-vk.subgroups failures
Product: Mesa Reporter: Mark Janes <mark.a.janes>
Component: Drivers/DRI/i965Assignee: Intel 3D Bugs Mailing List <intel-3d-bugs>
Status: RESOLVED MOVED QA Contact: Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity: normal    
Priority: medium    
Version: git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:

Description Mark Janes 2019-02-19 22:54:35 UTC
In mesa CI, about 10% of test runs generate a single failure in the subgroups category.  A quick look at the history shows the following failures:

dEQP-VK.subgroups.shuffle.subgroupshuffleup_uvec2_graphic
dEQP-VK.subgroups.shuffle.subgroupshuffleup_vec3_graphic
dEQP-VK.subgroups.quad.subgroupquadswapdiagonal_dvec3_graphic
dEQP-VK.subgroups.arithmetic.subgroupinclusivemin_uint_graphic
dEQP-VK.subgroups.quad.subgroupquadbroadcast_0_bool_graphic
dEQP-VK.subgroups.basic.subgroupelect_graphic
dEQP-VK.subgroups.quad.subgroupquadswaphorizontal_dvec3_graphic


Typical output for a failure:

  1022 / 1023 values passed

All tests in the recent CI history occure on GT3e systems, even though nearly half of the BDW in CI are GT2.
Comment 1 Jason Ekstrand 2019-02-20 23:43:44 UTC
Looking into this deeper, I really don't think it has anything to do with subgroups.  Instead, I suspect that the issue here has something to do with SSBO stores from graphics shader stages.  I dug through the bspec and couldn't find anything GT3 specific.
Comment 2 GitLab Migration User 2019-09-25 20:32:06 UTC
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