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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>8.1.Setting up MTRR</title><link rel="stylesheet" href="default.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.68.1"><link rel="start" href="index.html" title="MPlayer - The Movie Player"><link rel="up" href="video.html" title="Chapter8.Video output devices"><link rel="prev" href="video.html" title="Chapter8.Video output devices"><link rel="next" href="output-trad.html" title="8.2.Video outputs for traditional video cards"><link rel="preface" href="howtoread.html" title="How to read this documentation"><link rel="chapter" href="intro.html" title="Chapter1.Introduction"><link rel="chapter" href="install.html" title="Chapter2.Installation"><link rel="chapter" href="usage.html" title="Chapter3.Usage"><link rel="chapter" href="cd-dvd.html" title="Chapter4.CD/DVD usage"><link rel="chapter" href="faq.html" title="Chapter5.Frequently Asked Questions"><link rel="chapter" href="containers.html" title="Chapter6.Containers"><link rel="chapter" href="codecs.html" title="Chapter7.Codecs"><link rel="chapter" href="video.html" title="Chapter8.Video output devices"><link rel="chapter" href="audio.html" title="Chapter9.Audio output devices"><link rel="chapter" href="tv.html" title="Chapter10.TV"><link rel="chapter" href="radio.html" title="Chapter11.Radio"><link rel="chapter" href="ports.html" title="Chapter12.Ports"><link rel="chapter" href="mencoder.html" title="Chapter13.Basic usage of MEncoder"><link rel="chapter" href="encoding-guide.html" title="Chapter14.Encoding with MEncoder"><link rel="appendix" href="bugreports.html" title="AppendixA.How to report bugs"><link rel="appendix" href="bugs.html" title="AppendixB.Known bugs"><link rel="appendix" href="skin.html" title="AppendixC.MPlayer skin format"><link rel="appendix" href="history.html" title="AppendixD.History"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">8.1.Setting up MTRR</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="video.html">Prev</a></td><th width="60%" align="center">Chapter8.Video output devices</th><td width="20%" align="right"><a accesskey="n" href="output-trad.html">Next</a></td></tr></table><hr></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="mtrr"></a>8.1.Setting up MTRR</h2></div></div></div><p>
It is VERY recommended to check if the MTRR registers
are set up properly, because they can give a big performance boost.
</p><p>
Do a <span><strong class="command">cat /proc/mtrr</strong></span>:
</p><pre class="screen">
<code class="prompt">--($:~)--</code> cat /proc/mtrr
reg00: base=0xe4000000 (3648MB), size= 16MB: write-combining, count=9
reg01: base=0xd8000000 (3456MB), size= 128MB: write-combining, count=1</pre><p>
</p><p>
It's right, shows my Matrox G400 with 16MB memory. I did this from
XFree 4.x.x , which sets up MTRR registers automatically.
</p><p>
If nothing worked, you have to do it manually. First, you have to find the
base address. You have 3 ways to find it:
</p><div class="orderedlist"><ol type="1"><li><p>
from X11 startup messages, for example:
</p><pre class="screen">
(--) SVGA: PCI: Matrox MGA G400 AGP rev 4, Memory @ 0xd8000000, 0xd4000000
(--) SVGA: Linear framebuffer at 0xD8000000</pre><p>
</p></li><li><p>
from <tt class="filename">/proc/pci</tt> (use <span><strong class="command">lspci -v</strong></span>
command):
</p><pre class="screen">
01:00.0 VGA compatible controller: Matrox Graphics, Inc.: Unknown device 0525
Memory at d8000000 (32-bit, prefetchable)
</pre><p>
</p></li><li><p>
from mga_vid kernel driver messages (use <span><strong class="command">dmesg</strong></span>):
</p><pre class="screen">mga_mem_base = d8000000</pre><p>
</p></li></ol></div><p>
</p><p>
Then let's find the memory size. This is very easy, just convert video RAM
size to hexadecimal, or use this table:
</p><div class="informaltable"><table border="0"><colgroup><col><col></colgroup><tbody><tr><td>1 MB</td><td>0x100000</td></tr><tr><td>2 MB</td><td>0x200000</td></tr><tr><td>4 MB</td><td>0x400000</td></tr><tr><td>8 MB</td><td>0x800000</td></tr><tr><td>16 MB</td><td>0x1000000</td></tr><tr><td>32 MB</td><td>0x2000000</td></tr></tbody></table></div><p>
</p><p>
You know base address and memory size, let's setup MTRR registers!
For example, for the Matrox card above (<code class="literal">base=0xd8000000</code>)
with 32MB ram (<code class="literal">size=0x2000000</code>) just execute:
</p><pre class="screen">
echo "base=0xd8000000 size=0x2000000 type=write-combining" >| /proc/mtrr
</pre><p>
</p><p>
Not all CPUs have MTRRs. For example older K6-2 (around 266MHz,
stepping 0) CPUs don't have MTRRs, but stepping 12 does
(execute <span><strong class="command">cat /proc/cpuinfo</strong></span> to check it).
</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="video.html">Prev</a></td><td width="20%" align="center"><a accesskey="u" href="video.html">Up</a></td><td width="40%" align="right"><a accesskey="n" href="output-trad.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter8.Video output devices</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">8.2.Video outputs for traditional video cards</td></tr></table></div></body></html>
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