Keith Packard <kei...@keithp.com> writes: > On Thu, 21 Oct 2010 01:38:58 +0200, Francisco Jerez <curroje...@riseup.net> > wrote: > >> Nouveau uses the hardware interchannel synchronization primitives on >> demand (it kicks in when two channels have references to the same BO): >> the nouveau DRM guarantees that two command buffers rendering to/from >> the same BO will get executed in order as seen by the DRM. > > Would it make sense to have this only kick in when damage is reported to > the compositing manager? That would limit the number of semaphores you > stick in the command queue.
Not really, the decision is made by the kernel when it sees a reference to an in-flight buffer from the wrong channel, if that happens we can be sure we have to resort to some kind of synchronization before submitting the next batch, except on rare occasions.
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