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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BAT BYT] Sporadic failure from igt/gem_exec_flush@basic-batch-kernel-default-cmd"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95372#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BAT BYT] Sporadic failure from igt/gem_exec_flush@basic-batch-kernel-default-cmd"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95372">bug 95372</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>Yes. For the cmdparser there are 2 sources of incoherency: writes from the CPU
cache to memory are not being ordered with mfence; clflush; mfence and secondly
writes through the GTT are not immediately coherent. More details, ideas and
patches, on the mailing list from last year and other bugs that are even older.</pre>
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