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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SNB, BXT] up to 40% perf drop from "loader/dri3: Overhaul dri3_update_num_back" commit"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97549#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SNB, BXT] up to 40% perf drop from "loader/dri3: Overhaul dri3_update_num_back" commit"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97549">bug 97549</a>
from <span class="vcard"><a class="email" href="mailto:eero.t.tamminen@intel.com" title="Eero Tamminen <eero.t.tamminen@intel.com>"> <span class="fn">Eero Tamminen</span></a>
</span></b>
<pre>With modesetting:
* BXT: similar to new X DDX, perf OK (somewhat below X DDX)
* SNB: perf still bad, but better than with Intel DDX
-> on SNB the attached patch is needed to get performance on previous level
regardless of DDX.
Backtraces are from BXT, both with old (last month) X Intel DDX, before and
after the commit. Earlier dri3_update_num_back() was called when getting
buffers, now it's called when swapping.</pre>
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