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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [BDW Bisected] OglDrvCtx performance reduced by ~30% after use true PPGTT in Gen8+"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87726#c11">Comment # 11</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [BDW Bisected] OglDrvCtx performance reduced by ~30% after use true PPGTT in Gen8+"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87726">bug 87726</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>From recollection, OglDrvCtx had perf regressions (and distinct rate-limiting
steps) in mesa, dri[2,3] and the kernel. It was basically a glClear benchmark
across lots of contexts, which in many respects shows the same characteristics
as lots of clients. That is a level of integration testing above igt. Showing
the scaling characteristics of the kernel wrt to the number of contexts (be
they one fd or many) does have coverage in igt.</pre>
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