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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [BDW Bisected] OglBatch7 performance reduced by ~7% after enable execlists"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87725#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [BDW Bisected] OglBatch7 performance reduced by ~7% after enable execlists"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87725">bug 87725</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>Looking at my bdw-u system, the effect here seems to be attributable to the
increased latency of execlist submission to an idle GPU compared to legacy -
and that we are doing just enough work inside the execlist handler for the GPU
to become idle between batches. On my machine I can get comparable timings
between execlists and legacy by tuning the driver, but if my hypothesis is
valid such tuning will be highly dependent upon the system.</pre>
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