On Wed, Jun 10, 2015 at 06:33:49AM -0400, Brian J. Murrell wrote: > On Sun, 2015-06-07 at 13:11 -0400, Brian J. Murrell wrote: > > I have an: > > > > 00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06) > > > > in a Fedora 21 machine running Linux 4.0.4. > > > > While this is all generally working, the display has pauses where there > > should be fluid motion. Watching a video with mplayer for example, > > plays about a second or so, then pauses for .25 to .5 (just a guess) of > > a second and then continues playing. glxgears does the same thing. > > While it's reporting ~60fps the gears turn then stop then turn then > > stop. > > > > I see the same thing dragging windows across the screen or even just > > scrolling (GTK3) application windows. > > > > I'm using both the DVI and the VGA output of this card, FWIW. > > > > What additional information can I provide to help diagnose this problem? > > Is there anything I can do to help debug what this issue is? > > The pauses translate into sponginess and latencies that make using this > display very unpleasant. :-( sudo perf record -g -a -c 1 -e i915:i915_gem_request_wait_begin is likely to capture the culprit. Though to be precise you need to look at wait_begin + wait_end to measure the stall (some waits are more harmless than others). As a first approximation just using perf will be good enough to get a few leads. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
