Forums - Strange Vulkan queue family in Adreno 730

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Strange Vulkan queue family in Adreno 730
tuketet
Join Date: 18 Apr 23
Posts: 2
Posted: Tue, 2023-04-18 07:13
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Hi,

I have seen that some Android devices with Adreno 730 have a strange queue family: https://vulkan.gpuinfo.org/displayreport.php?id=20262#device

This queue family has very limited capabilities: no GRAPHICS, no COMPUTE, not even TRANSFER.

I'm left wondering what could be the intended use case for this queue family.

I have also asked in StackOverflow: https://stackoverflow.com/questions/75996360/what-could-be-the-purpose-o...

 

Cheers!

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Re: Strange Vulkan queue family in Adreno 730
jleger
Join Date: 23 Aug 16
Posts: 15
Posted: Mon, 2023-07-31 10:39
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The Adreno driver does expose a queue family with onlyVK_QUEUE_SPARSE_BINDING_BIT and the spec points out that such queues are allowed:

Quote:
While some implementations may include VK_QUEUE_SPARSE_BINDING_BIT support in queue families that also include graphics and compute support, other implementations may only expose a VK_QUEUE_SPARSE_BINDING_BIT-only queue family.

The intended use case is queue is for applicatoins to manage sparse bindings in a separate queue if they so choose.   Whether this is warranted depends on the specific application use-case.   The "supports present" shown on gpuinfo relates to vkGetPhysicalDeviceSurfaceSupportKHR which is exposed/implemented by the platform rather than by the driver.   I agree the end-result of a queue family that supports sparse bindings plus presents is a little unexpected.

 

 

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