On Mon, Nov 02, 2015 at 05:39:54AM +0000, Gong, Zhipeng wrote: > Chris- > > The patch cannot be applied on the latest drm-intel-nightly directly. > I modified it a little bit to make it applied. > The patch can help much in HSW, but a little bit in BDW. > The test is to transcode 26 streams, which creates 244 threads. > > CPU util | w/o patch | w/ patch > ---------------------------------------------------------- > HSW async 1 | 102% | 61% > HSW async 5 | 114% | 46% > BDW async 1 | 116% | 116% > BDW async 5 | 111% | 107% The problem on bdw is likely to be frequent inter-ring synchronisation keeping the number of waiters at 1 (i.e. lack of semaphores). Note that the first waiter gets the busywait before waiting on the interrupt. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
