On Thu, May 18, 2017 at 10:46:32AM +0100, Chris Wilson wrote: > When userspace is doing most of the work, avoiding relocs (using > NO_RELOC) and opting out of implicit synchronisation (using ASYNC), we > still spend a lot of time processing the arrays in execbuf, even though > we now should have nothing to do most of the time. One issue that > becomes readily apparent in profiling anv is that iterating over the > large execobj[] is unfriendly to the loop prefetchers of the CPU and it > much prefers iterating over a pair of arrays rather than one big array. Joonas pointed out that given the alignment of vma in our slab, I have a few bits to spare in the eb->vma[] pointers, now only using a few bits for state tracking of vma through execbuf and he does like bit packing into pointers very much... -Chris > -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
