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hash_failed
2012 Dec 20
0
reproducible CACHE_ERRORS
...s.
3) If you can't see it now, resize glxgears window or add more glxinfos.
Note: you need at least 2 CPUs.
Usually the error looks like this (with a bit improved logging):
nouveau E[ PFIFO][0000:02:00.0] CACHE_ERROR - ch 6 [glxgears[15559]] subc 0 mthd 0x0060 data 0x8000000f c1p0 0x20000010 HASH_FAILED (unknown bits 0x20000000) c1_hash 0x00000436
What I found so far:
1) It's triggered by setting of NV11_SUBCHAN_DMA_SEMAPHORE to NvSema
(0x8000000f) in nv84_fence_emit. Hw tells us it cannot find ramht entry
for NvSema object (NV04_PFIFO_CACHE1_PULL0 == HASH_FAILED, frequently
unknow...