7 Oct
2020
7 Oct
'20
3:24 p.m.
Quoting Chris Wilson (2020-10-07 16:17:18)
The GPU is trashing the low pages of its reserved memory upon reset. If we are using this memory for ringbuffers, then we will dutiful resubmit the trashed rings after the reset causing further resets, and worse. We must exclude this range from our own use. The value of 128KiB was found by empirical measurement on gen9.
Probably should double it to 256K, just to be on the safe side? -Chris