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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW Bisected] OglDrvCtx performance reduced by ~30% after use true PPGTT in Gen8+"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87726">87726</a>
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<th>Summary</th>
<td>[BDW Bisected] OglDrvCtx performance reduced by ~30% after use true PPGTT in Gen8+
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>wendy.wang@intel.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<pre>Environment:
-----------------------------------
Platform: BDW
Libdrm:
(master)libdrm-2.4.58-19-gf99522e678dbbaffeca9462a8edcbe900574dc12
Mesa: (master)873d7351c5a696b6f8493c907eb8c76b8cb632da
Xserver:
(master)xorg-server-1.16.99.901-98-g0f5fdaf600bfeada966aea942cb3e347d4efee30
Xf86_video_intel:
(master)2.99.916-177-g99537089346ed7a1bc6b02349fad93845e865bb9
Cairo: (master)4a225fca5f121c31ddaa0af80a13bf95a7f21a5b
Libva: (master)8986ec692b19d8dd6bd2aa118b5dffbd05a8f909
Libva_intel_driver: (master)b5d6d9d425a6d539b27d22992bda05f79d1a0622
Kernel: (drm-intel-nightly)8d22327ae006186bad9f95c300fad5ecd5e961a4
Bug detailed description:
---------------------------------------------
OglDrvCtx performance reduced by ~30% after use true PPGTT in Gen8+
Bisect drm-intel-next-queued kernel branch, the first bad commit is:
2f82bbdf3d4f1361c3d713c516d8aa390102374d is the first bad commit
commit 2f82bbdf3d4f1361c3d713c516d8aa390102374d
Author: Michel Thierry <<a href="mailto:michel.thierry@intel.com">michel.thierry@intel.com</a>>
Date: Mon Dec 15 14:58:00 2014 +0000
drm/i915: Use true PPGTT in Gen8+ when execlists are enabled
In Gen8+, full ppgtt needs execlist, otherwise the ctx switch can hang.
Also remove the current restriction, a user should be able to explicitly
set
ppgtt=2.
Reproduce steps:
---------------------------------------------
1, xinit &
2, cd /usr/local/games/OpenGL/SynMark2_6
3. ./synmark2 OglDrvCtx</pre>
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