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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [IVB/BYT/HSW Bisected]Synmark2_DrvCtx performance reduced 50%~80%"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84501#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [IVB/BYT/HSW Bisected]Synmark2_DrvCtx performance reduced 50%~80%"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84501">bug 84501</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>So what is happening is that we are effectively leaking contexts, forcing us to
evict and stall.
git://people.freedesktop.org/~ickle/linux-2.6 requests
should contain the fix (in
<a href="http://cgit.freedesktop.org/~ickle/linux-2.6/commit/?h=requests&id=4a9a7642673ec3365ce6de7fb91238ab996ac1f0">http://cgit.freedesktop.org/~ickle/linux-2.6/commit/?h=requests&id=4a9a7642673ec3365ce6de7fb91238ab996ac1f0</a>)
which should get full-ppgtt to within about 10% of aliasing-pgtt in OglDrvCtx.
(Since we allocate and clear the entire PDE upon context creation, there will
be measurable extra overhead.)</pre>
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