Quoting Lionel Landwerlin (2019-02-19 10:31:52) > On 19/02/2019 09:18, Chris Wilson wrote: > > Quoting Lionel Landwerlin (2019-02-18 18:35:28) > >> We're about to introduce an options to open the perf stream, giving > >> the user ability to configure how often it wants the kernel to poll > >> the OA registers for available data. > >> > >> Right now the workaround against the OA tail pointer race condition > >> requires at least twice the internal kernel polling timer to make any > >> data available. > > I think this code is bogus. I do not think there is an aging problem on > > hsw+, the only cause of zeroes being written that I've found is from > > changing configs. > > -Chris > > > > Hmm... I'm pretty sure there is an issue and it's actually worse on the > HSW machine I have than on later machines. > > The DRM_NOTE in that function is appearing a lot more on HSW. But how much of that is due to not actually using the correct mb ourselves, and how much of that is the OA actually writing zero? -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
