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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Vulkan tests fail on 4.12 drm-tip"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101571#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Vulkan tests fail on 4.12 drm-tip"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101571">bug 101571</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>Any new bo returned to userspace is zeroed. That data may entirely reside in
the CPU cache, and may remain there across the GPU write into main memory. The
clflush performed before the read to invalidate the cache may in fact just
cause the writeback of the cache to main memory, overwriting the results.</pre>
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