On Fri, Dec 04, 2015 at 10:36:45AM +0100, Daniel Vetter wrote: > On Tue, Dec 01, 2015 at 04:57:11PM +0000, Dave Gordon wrote: > > On 29/11/15 08:48, Chris Wilson wrote: > > >We have testcases to ensure that seqno wraparound works fine, so we can > > >forgo forcing everyone to encounter seqno wraparound during early > > >uptime. seqno wraparound incurs a full GPU stall so not forcing it > > >will eliminate one jitter from the early system. > > > > > >Advancing the global next_seqno after a GPU reset is equally pointless. > > > > > >Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > > > The real bug is that seqno wraparound forces GPU idle, can we fix that > > instead? > > hw semaphores will fall over if we don't, but I guess we can forgo the > idle if there's no hw semaphores enabled. And yeah I'd like to keep this > little trick to exercise wrap-around more often too. But we have a test case that you can run as often as you like as part of CI setup even, to set the wraparound to happen at a psuedo-random location during the testing. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
