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Tue May 3 15:05:30 PDT 2016
Now I did the same but using my native x11 display with the opengl nvidia drivers. To do that, simply export the variable USE_NATIVE_XDISPLAY=1 before running the tests. I did several runs of this, storing each run in a different directory. This are the results:
-> Run 1: Unexpected flakiness: image-only failures (159) <a href="https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-xdisplay1/results.html">https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-xdisplay1/results.html</a>
-> Run 2: Unexpected flakiness: image-only failures (25) <a href="https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-xdisplay2/results.html">https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-xdisplay2/results.html</a>
-> Run 3: Unexpected flakiness: image-only failures (22) <a href="https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-xdisplay3/results.html">https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-xdisplay3/results.html</a>
So, my conclusion is that is not caused by swrast. I can reproduce the flakiness also with the nvidia driver.
BTW, Check this results:
- swrast: <a href="https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-swrast/fast/flexbox/auto-height-with-flex-diffs.html">https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-swrast/fast/flexbox/auto-height-with-flex-diffs.html</a>
- nvidia run 1: <a href="https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-xdisplay1/fast/flexbox/auto-height-with-flex-diffs.html">https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-xdisplay1/fast/flexbox/auto-height-with-flex-diffs.html</a>
- nvidia run 2: <a href="https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-xdisplay2/fast/flexbox/auto-height-with-flex-diffs.html">https://people.igalia.com/clopez/wkbug/161242/xresults/layout-test-results-xvfb-xdisplay2/fast/flexbox/auto-height-with-flex-diffs.html</a>
As you can see. Both the expected and the actual images are different on each one of the three cases.
On the nvidia run 2, the expected result didn't even reached the point to render anything than a blank viewport.
I think that using swrast instead of hardware-backed opengl is not the problem here.</pre>
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