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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [v4.10 snb] weird seqno/request tracking - HEAD overtakes TAIL"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99671#c43">Comment # 43</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [v4.10 snb] weird seqno/request tracking - HEAD overtakes TAIL"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99671">bug 99671</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>Just documenting my continual failure here. Having run with DEBUG_GEM enabled,
you also showed that this assert doesn't fire:
void __i915_gem_request_submit(struct drm_i915_gem_request *request)
{
GEM_BUG_ON(i915_seqno_passed(intel_engine_get_seqno(engine), seqno));
}
which is the scenario I was worrying about in <a href="show_bug.cgi?id=99671#c39">comment 39</a>. I still need to write
a test to see if the tail write goes backwards.</pre>
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