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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Hangcheck timer too agressive to pass dEQP for SNBGT1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93029#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Hangcheck timer too agressive to pass dEQP for SNBGT1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93029">bug 93029</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>(In reply to Mika Kuoppala from <a href="show_bug.cgi?id=93029#c5">comment #5</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=120213" name="attach_120213" title="drm/i915: Teach hangcheck about long operations on rings">attachment 120213</a> <a href="attachment.cgi?id=120213&action=edit" title="drm/i915: Teach hangcheck about long operations on rings">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=93029&attachment=120213'>[review]</a> [review]
> drm/i915: Teach hangcheck about long operations on rings</span >
I don't believe that it is flushing the tiny WRITE_CACHE that is causing the
huge delays, so guess it must be the top-of-pipe synchronisation (i.e. the wait
for the shader to complete). Still this smells like a DoS issue inside the
batch.
So what is different if mesa adds the PIPE_CONTROL as its last instruction in
the batch?</pre>
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