On Wed, 19 Nov 2014 15:32:38 +0900 Alexandre Courbot <acour...@nvidia.com> wrote:
> Some more information: CPU usage of the EGL app (glmark2 here) is much > higher when this patch is applied, which I presume is what triggers the > frame skips. > > On 11/19/2014 03:05 PM, Alexandre Courbot wrote: > > Hi guys, > > > > I am seeing a severe performance regression (lots frame drops when > > running EGL apps in Weston) on Tegra/GK20A since the following commit: > > > > commit 363b53f00069af718f64cf047f19ad5681a8bf6d > > Author: Marek Olšák <marek.ol...@amd.com> > > Date: Sat Nov 1 14:31:09 2014 +0100 > > > > egl: remove egl_gallium from the loader > > > > Reverting said commit on top of master brings the expected performance > > back. I am not knowledgeable enough about Mesa to speculate about the > > reason, but could we try to investigate why this happens and how we > > could fix this? Hi, that sounds like you used to get egl_gallium as the EGL driver, and after that patch you get egl_dri2. These two have separate Wayland platform implementations (and probably all other platforms as well?). I think that might be a lead for investigation. EGL debug environment variable (EGL_LOG_LEVEL=debug) should confirm which EGL driver gets loaded. You can force the EGL driver with e.g. EGL_DRIVER=egl_dri2. Note, that there are two different EGL platforms in play: DRM/GBM for Weston, and Wayland for the app. Have you confirmed the problem is in the app side? That is, does Weston itself run smoothly? FYI, I've been slowly working on https://github.com/ppaalanen/wesgr but the Weston patches are not upstream yet, and I'm in the process of updating them currently. I hope this tool might give some indication whether the skips/stalls happen in Weston or not. You say "frame drops", how do you see that? Only on screen, or also in the app performance profile? How's the average framerate for the app? Thanks, pq _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
