On Wednesday, April 28, 2021 9:56:25 AM PDT Jason Ekstrand wrote: > On Wed, Apr 28, 2021 at 11:41 AM Matthew Auld <matthew.auld@xxxxxxxxx> wrote: [snip] > > Slightly orthogonal: what does Mesa do here for snooped vs LLC > > platforms? Does it make such a distinction? Just curious. > > In Vulkan on non-LLC platforms, we only enable snooping for things > that are going to be mapped: staging buffers, state buffers, batches, > etc. For anything that's not mapped (tiled images, etc.) we leave > snooping off on non-LLC platforms so we don't take a hit from it. In > GL, I think it works out to be effectively the same but it's a less > obvious decision there. > > --Jason iris currently enables snooping on non-LLC platforms when Gallium marks a resource as PIPE_USAGE_STAGING, which generally means it's going to be mapped and "fast CPU access" is desired. Most buffers are not snooped. I don't believe i965 uses snooping at all, surprisingly. --Ken
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