On Thu, Jun 15, 2017 at 9:14 AM, Chris Wilson <ch...@chris-wilson.co.uk> wrote:
> Quoting Jason Ekstrand (2017-06-15 16:59:19) > > On Thu, Jun 15, 2017 at 4:11 AM, Chris Wilson <ch...@chris-wilson.co.uk> > wrote: > > The kernel does have a LRI after a flush before signaling the batch > is > > complete. I don't see a need to add another... > > > > The question is whether this posting is required for GPU visibility > of > > results or just CPU? I suspect this is just for CPU in which case it > > doesn't belong here at all, but before flagging rendering as ready > for > > async (i.e. not involving the kernel) inspection. > > > > > > The docs, if you choose to believe them, seem to indicate that this is > needed > > for GPU visibility as well as CPU. > > The kernel has LRI (for semaphore updates) not LRM, is that significant? > Took me long enough to notice the difference. > I don't know. We're getting so far outside the realm of documentation here that it's crazy. What I do know is that the comments in the windows source indicate that SDI is insufficient on Haswell. My gut says it has something to do with forcing a round-trip through the memory controller. For semaphore updates, LRI may be sufficient since they're register-based on gen7.
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