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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [r600g, bisected] regression: NI/Turks WebGL (FishGL) massive speed decrease ~33%"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97273">97273</a>
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<th>Summary</th>
<td>[r600g, bisected] regression: NI/Turks WebGL (FishGL) massive speed decrease ~33%
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>git
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (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>Drivers/Gallium/r600
</td>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>Dieter@nuetzel-hh.de
</td>
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<th>QA Contact</th>
<td>dri-devel@lists.freedesktop.org
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</tr></table>
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<pre>Current Mesa (git-3f100b7) and some stable versions show massive speed decrease
on FishGL (WebGL) demo with konqueror 4.14.8 (KDE 4.14.9).
<a href="http://www.fishgl.com/">http://www.fishgl.com/</a>
look at the aquarium: ~60 fps -> ~40 fps
look from inside (diver): ~30 fps -> ~20 fps
I've bisected it to:
/opt/mesa> git bisect good
3735a925ef5692c836c4d26d6adee370dae1c2b0 is the first bad
commit
commit 3735a925ef5692c836c4d26d6adee370dae1c2b0
Author: Nicolai Hähnle <<a href="mailto:nicolai.haehnle@amd.com">nicolai.haehnle@amd.com</a>>
Date: Wed Jun 8 13:24:14 2016 +0200
st/mesa: cache staging texture for glReadPixels
v2: add ST_DEBUG flag for disabling (suggested by Ilia)
Reviewed-by: Marek Olšák <<a href="mailto:marek.olsak@amd.com">marek.olsak@amd.com</a>> (v1)
:040000 040000 f3adb5adc43e4def32bd23896489520d8cae84c6
72b374e2221e9cc1306d7bfacf39780ec5e42d36 Msrc
<a href="https://cgit.freedesktop.org/mesa/mesa/log/?ofs=1150">https://cgit.freedesktop.org/mesa/mesa/log/?ofs=1150</a>
Revert didn't went smooth, so I've commented:
diff --git a/src/mesa/state_tracker/st_cb_readpixels.c
b/src/mesa/state_tracker/st_cb_readpixels.c
index 8eb839d..3af9530 100644
--- a/src/mesa/state_tracker/st_cb_readpixels.c
+++ b/src/mesa/state_tracker/st_cb_readpixels.c
@@ -329,7 +329,7 @@ try_cached_readpixels(struct st_context *st, struct
st_renderbuffer *strb,
struct pipe_resource *src = strb->texture;
struct pipe_resource *dst = NULL;
- if (ST_DEBUG & DEBUG_NOREADPIXCACHE)
+ /* if (ST_DEBUG & DEBUG_NOREADPIXCACHE) */
return NULL;
/* Reset cache after invalidation or switch of parameters. */
After that speed was 'normal'.</pre>
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