On Wed, Sep 16, 2020 at 11:04 AM Alyssa Rosenzweig <alyssa.rosenzweig@xxxxxxxxxxxxx> wrote: > > > So I get a performance regression with the dma-coherent approach, even if it's > > clearly the cleaner. > > That's bizarre -- this should really be the faster of the two. Coherency may not be free. CortexA9 had something like 4x slower memcpy if SMP was enabled as an example. I don't know if there's anything going on like that specifically here. If there's never any CPU accesses mixed in with kmscube, then there would be no benefit to coherency. Rob _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
