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[C - VA] Chunk clean not working on 2080Ti, no issues on TitanV and 1080Ti #13

@delanyinspiron6400

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@delanyinspiron6400

It seems that simply writing to the chunk queues when cleaning them for re-use does not work properly on the newer architecture, even threadfences did not solve the issue.
Same issue is not present (it seems) on the TITAN V and 1080Ti.
Problem is solved by switching from writing uint4s to either a stg_cg or an atomicExch on CC7.5.

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