On Fri, Aug 19, 2016 at 02:13:16PM +0530, akash.goel@xxxxxxxxx wrote: > From: Akash Goel <akash.goel@xxxxxxxxx> > > In order to have fast reads from the GuC log buffer, used SSE4.1 movntdqa > based memcpy function i915_memcpy_from_wc. > GuC log buffer has a WC type vmalloc mapping and copying using movntqda > from WC type memory is almost as fast as reading from WB memory. > This will further reduce the log buffer sampling time, so is needed dearly > to deal with the flush interrupt storm when GuC is generating logs at a > very high rate. > Ideally SSE 4.1 should be present on all chipsets supporting GuC based > submisssions, but if not then logging will not be enabled. > > v2: Rebase. > > Suggested-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Akash Goel <akash.goel@xxxxxxxxx> > Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> Should be squashed with patch 16 (use MAP_WC). -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
