Comment # 14
on bug 93301
from Marek Olšák
No, Hawaii doesn't have DCC. The issue can indeed be that there is not enough address space. Mesa doesn't unmap most buffers, because mmap is a very costly operation. Such buffers are only unmapped when destroyed. This is obviously a problem on 32-bit. Possible solutions: 1) Always unmap buffers at appropriate places. This can have a significant performance cost in CPU-bound apps. 2) Clear pb_cache on mmap failure and try mmap again. (pb_cache typically contains staging buffers, which are always mapped. Therefore, pb_cache completely hides allocation, GPU mmap, and CPU mmap overhead, but it also contributes to address space usage.)
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