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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GEN8] Large perf drop in windowed/composited tests performance"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103847">103847</a>
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<th>Summary</th>
<td>[GEN8] Large perf drop in windowed/composited tests performance
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>git
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<th>Hardware</th>
<td>Other
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Drivers/DRI/i965
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<th>Assignee</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>eero.t.tamminen@intel.com
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<p>
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<pre>SW setup:
- Mesa git
- X server git
- modesetting driver
- drm-tip kernel v4.14 (which has somewhat worse texture read perf than 4.13)
- everything else: Ubuntu 16.04 (Unity/compiz)
- whole system is using the Mesa git version, not just test programs
Between following Mesa commits:
2017-11-13 257edb5b9aedc9fc5d5c13eb2f48a0c11d15456f glx/dri3: Fix passing
renderType into glXCreateContext
2017-11-14 6ac2d16901927013393f873a34c717ece5014c1a i965/fs: Fix
extract_i8/u8 to a 64-bit destination
On 1-channel BSW (N3050 NUC), performance in all windowed/composited tests
dropped very clearly. Drop scales directly with FPS, so it was largest in test
with highest FPS:
- 25-30% in GpuTest Triangle
- 6-7% GLB 2.7 Egypt
Same effect is seen also on BDW GT3, but it's much smaller, and even smaller on
BDW GT2. -> I think the issue scales also depending on how memory bandwidth
limited the GPU is.
There's no change in fullscreen benchmarks, only in windowed / composited ones.
>From the Mesa change log between these commits, external BO and MOCS changes
look most likely candinates.
(Not bisecting this, just reporting it in hopes that somebody else can
reproduce & bisect it.)</pre>
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