<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [CI][SHARDS] igt@perf@(blocking|polling) - fail - Failed assertion: kernel_ns <= (test_duration_ns / 100ull)" href="https://bugs.freedesktop.org/show_bug.cgi?id=110728#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [CI][SHARDS] igt@perf@(blocking|polling) - fail - Failed assertion: kernel_ns <= (test_duration_ns / 100ull)" href="https://bugs.freedesktop.org/show_bug.cgi?id=110728">bug 110728</a> from <a class="email" href="mailto:contact@emersion.fr" title="emersion <contact@emersion.fr>"> emersion</a> <pre>In [1], 170ms (±10ms) are spent blocking in the kernel. This is more than 1% of the test duration (10s = 10000ms, time spent in kernel is 1.7%). In other logs, similar issues can be observed. This means that we're burning too many CPU cycles in the kernel when reading from Observation Architecture. User impact: some performance issues when measuring performance. I suspect these performance issues only happen when actively using OA, so most users shouldn't be affected, but I'm not familiar with OA, so don't quote me on this. [1]: <a href="https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6176/shard-skl6/igt@perf@blocking.html">https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6176/shard-skl6/igt@perf@blocking.html</a></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>