Comment # 2
on bug 92775
from david1.zhou@amd.com
(In reply to Michel Dänzer from comment #1) > (In reply to Shawn Starr from comment #0) > > One solution discussed is to split up the transfer into smaller chunks in > > radeon_ttm. > > Specifically, here's how I think a fallback could be implemented in the > kernel driver which can never fail because of fragmentation or resource > starvation: > > During initialization, reserve some pinned GTT memory for bounce buffers. > When a BO can't be bound to GTT for eviction as in the case reported here, > instead do the eviction directly from VRAM to CPU domain in one or several > passes of: > 1. Copy part of the BO from VRAM to one of the reserved bounce buffers in > GTT using the GPU. > 2. Copy that part of the BO from the bounce buffer to the BO's system RAM > pages using the CPU. if we can split a large BO to two parts, one is in VRAM, one is in GTT, seems also to be helpful for this case.
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