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List: kwin
Subject: Re: Review Request: Swap vsync order, trade in 1frame lag,
From: Martin_Gräßlin <kde () martin-graesslin ! com>
Date: 2011-11-07 17:35:50
Message-ID: 20111107173550.13840.88540 () vidsolbach ! de
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http://git.reviewboard.kde.org/r/103058/#review7995
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I'm fine with it to go in even after feature freeze, just in case that you =
want to ship the whole package including the TODOs. Would be nice to have i=
t before beta tagging, though.
kwin/options.cpp
<http://git.reviewboard.kde.org/r/103058/#comment6867>
meh that doesn't look nice. Is there no better way to get it? Let me gu=
ess: the language from nvidia_settings does not have to be the same as retu=
rned by QLocale::system()?
- Martin Gr=C3=A4=C3=9Flin
On Nov. 6, 2011, 6:17 p.m., Thomas L=C3=BCbking wrote:
> =
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/103058/
> -----------------------------------------------------------
> =
> (Updated Nov. 6, 2011, 6:17 p.m.)
> =
> =
> Review request for kwin and Martin Gr=C3=A4=C3=9Flin.
> =
> =
> Description
> -------
> =
> This performs a paint & glFlush immediately after the buffer swapping and=
defers the next swapping to the next anticipated frame (or idling)
> The behavior is still not as deterministic as we hoped to be since we can=
not measure the time for the actual vsync :\
> I set a fuzzyness of 6ms what leads to a majority of 2-3ms times in waits=
ync but single wait times up to 8 or 9ms occur (what ultimately can be part=
of the syncing itself)
> =
> There's some debug code to print lagging.
> =
> TODO:
> - attempt egl support
> - probably lie to the effects about the time
> =
> =
> Diffs
> -----
> =
> kwin/composite.cpp bc29233 =
> kwin/options.cpp 19c3ee5 =
> kwin/scene.h d8bcf48 =
> kwin/scene.cpp 413e46f =
> kwin/scene_basic.h a087eb5 =
> kwin/scene_basic.cpp cc8dbdd =
> kwin/scene_opengl.h e13d8a5 =
> kwin/scene_opengl_egl.cpp 22e082c =
> kwin/scene_opengl_glx.cpp ddebcd0 =
> kwin/scene_xrender.h 6c916c8 =
> kwin/scene_xrender.cpp 3618d79 =
> kwin/workspace.h e4db7e7 =
> kwin/workspace.cpp 70b2df8 =
> =
> Diff: http://git.reviewboard.kde.org/r/103058/diff/diff
> =
> =
> Testing
> -------
> =
> I've used a CRT for testing which can sync every 11ms ie. 85Hz and lowere=
d the maxFPS down to 10fps with pretty constant results for the time lost w=
aiting for the sync.
> =
> =
> Thanks,
> =
> Thomas L=C3=BCbking
> =
>
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This is an automatically generated e-mail. To reply, visit:
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: \
-pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I'm fine with it to \
go in even after feature freeze, just in case that you want to ship the whole package \
including the TODOs. Would be nice to have it before beta tagging, though.</pre> <br \
/>
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<table width="100%" border="0" bgcolor="white" style="border: 1px solid #C0C0C0; \
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<th colspan="4" bgcolor="#F0F0F0" style="border-bottom: 1px solid #C0C0C0; \
font-size: 9pt; padding: 4px 8px; text-align: left;"> <a \
href="http://git.reviewboard.kde.org/r/103058/diff/1/?file=40442#file40442line67" \
style="color: black; font-weight: bold; text-decoration: \
underline;">kwin/options.cpp</a> <span style="font-weight: normal;">
(Diff revision 1)
</span>
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</thead>
<tbody style="background-color: #e4d9cb; padding: 4px 8px; text-align: center;">
<tr>
<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int \
currentRefreshRate()</pre></td>
</tr>
</tbody>
<tbody>
<tr>
<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" \
align="right"><font size="2"></font></th> <td bgcolor="#c5ffc4" width="50%"><pre \
style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td> <th \
bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid \
#C0C0C0;" align="right"><font size="2">67</font></th> <td bgcolor="#c5ffc4" \
width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> \
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span \
class="n">ok</span><span class="p">)</span></pre></td> </tr>
<tr>
<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" \
align="right"><font size="2"></font></th> <td bgcolor="#c5ffc4" width="50%"><pre \
style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td> <th \
bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid \
#C0C0C0;" align="right"><font size="2">68</font></th> <td bgcolor="#c5ffc4" \
width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> \
<span class="n">frate</span> <span class="o">=</span> <span \
class="n">QLocale</span><span class="o">::</span><span class="n">system</span><span \
class="p">().</span><span class="n">toFloat</span><span class="p">(</span><span \
class="n">reply</span><span class="p">,</span> <span class="o">&</span><span \
class="n">ok</span><span class="p">);</span></pre></td> </tr>
<tr>
<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" \
align="right"><font size="2"></font></th> <td bgcolor="#c5ffc4" width="50%"><pre \
style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td> <th \
bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid \
#C0C0C0;" align="right"><font size="2">69</font></th> <td bgcolor="#c5ffc4" \
width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> \
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span \
class="n">ok</span><span class="p">)</span></pre></td> </tr>
<tr>
<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" \
align="right"><font size="2"></font></th> <td bgcolor="#c5ffc4" width="50%"><pre \
style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td> <th \
bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid \
#C0C0C0;" align="right"><font size="2">70</font></th> <td bgcolor="#c5ffc4" \
width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> \
<span class="n">frate</span> <span class="o">=</span> <span \
class="n">QLocale</span><span class="p">(</span><span class="n">QLocale</span><span \
class="o">::</span><span class="n">German</span><span class="p">).</span><span \
class="n">toFloat</span><span class="p">(</span><span class="n">reply</span><span \
class="p">,</span> <span class="o">&</span><span class="n">ok</span><span \
class="p">);</span> <span class="c1">// ","</span></pre></td> </tr>
<tr>
<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" \
align="right"><font size="2"></font></th> <td bgcolor="#c5ffc4" width="50%"><pre \
style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td> <th \
bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid \
#C0C0C0;" align="right"><font size="2">71</font></th> <td bgcolor="#c5ffc4" \
width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> \
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span \
class="n">ok</span><span class="p">)</span></pre></td> </tr>
<tr>
<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" \
align="right"><font size="2"></font></th> <td bgcolor="#c5ffc4" width="50%"><pre \
style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td> <th \
bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid \
#C0C0C0;" align="right"><font size="2">72</font></th> <td bgcolor="#c5ffc4" \
width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> \
<span class="n">frate</span> <span class="o">=</span> <span \
class="n">QLocale</span><span class="p">(</span><span class="n">QLocale</span><span \
class="o">::</span><span class="n">English</span><span class="p">).</span><span \
class="n">toFloat</span><span class="p">(</span><span class="n">reply</span><span \
class="p">,</span> <span class="o">&</span><span class="n">ok</span><span \
class="p">);</span> <span class="c1">// "."</span></pre></td> </tr>
</tbody>
</table>
<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; \
white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">meh that \
doesn't look nice. Is there no better way to get it? Let me guess: the language \
from nvidia_settings does not have to be the same as returned by \
QLocale::system()?</pre> </div>
<br />
<p>- Martin</p>
<br />
<p>On November 6th, 2011, 6:17 p.m., Thomas Lübking wrote:</p>
<table bgcolor="#fefadf" width="100%" cellspacing="0" cellpadding="8" \
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<div>Review request for kwin and Martin Gräßlin.</div>
<div>By Thomas Lübking.</div>
<p style="color: grey;"><i>Updated Nov. 6, 2011, 6:17 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" \
style="border: 1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">This performs a paint & glFlush immediately after the buffer \
swapping and defers the next swapping to the next anticipated frame (or idling) The \
behavior is still not as deterministic as we hoped to be since we cannot measure the \
time for the actual vsync :\ I set a fuzzyness of 6ms what leads to a majority of \
2-3ms times in waitsync but single wait times up to 8 or 9ms occur (what ultimately \
can be part of the syncing itself)
There's some debug code to print lagging.
TODO:
- attempt egl support
- probably lie to the effects about the time</pre>
</td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">I've used a CRT for testing which can sync every 11ms ie. 85Hz and \
lowered the maxFPS down to 10fps with pretty constant results for the time lost \
waiting for the sync.</pre> </td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>kwin/composite.cpp <span style="color: grey">(bc29233)</span></li>
<li>kwin/options.cpp <span style="color: grey">(19c3ee5)</span></li>
<li>kwin/scene.h <span style="color: grey">(d8bcf48)</span></li>
<li>kwin/scene.cpp <span style="color: grey">(413e46f)</span></li>
<li>kwin/scene_basic.h <span style="color: grey">(a087eb5)</span></li>
<li>kwin/scene_basic.cpp <span style="color: grey">(cc8dbdd)</span></li>
<li>kwin/scene_opengl.h <span style="color: grey">(e13d8a5)</span></li>
<li>kwin/scene_opengl_egl.cpp <span style="color: grey">(22e082c)</span></li>
<li>kwin/scene_opengl_glx.cpp <span style="color: grey">(ddebcd0)</span></li>
<li>kwin/scene_xrender.h <span style="color: grey">(6c916c8)</span></li>
<li>kwin/scene_xrender.cpp <span style="color: grey">(3618d79)</span></li>
<li>kwin/workspace.h <span style="color: grey">(e4db7e7)</span></li>
<li>kwin/workspace.cpp <span style="color: grey">(70b2df8)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/103058/diff/" style="margin-left: \
3em;">View Diff</a></p>
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