Any tests that use front buffer rendering cannot be run concurrently. I think that's some other cases. <div class="gmail_quote">On Nov 20, 2015 12:32, "Ilia Mirkin" <<a href="mailto:imirkin@alum.mit.edu">imirkin@alum.mit.edu</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">It looks like we're up to something like 1K non-concurrent piglit tests... maybe more. Can someone who actually understands the issues explain what makes a piglit test unreliable when run concurrently with another test? Then we can go and enable concurrency on probably 75% of the currently-marked-nonconcurrent tests. Thanks, -ilia _______________________________________________ Piglit mailing list <a href="mailto:Piglit@lists.freedesktop.org">Piglit@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/piglit" rel="noreferrer" target="_blank">http://lists.freedesktop.org/mailman/listinfo/piglit</a> </blockquote></div>