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	<title>Kanru&#039;s 探險日誌 &#187; exa</title>
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	<description>當發現美好的事物時，所要做的第一件事，就是把它分享給所有人</description>
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		<title>X-Server 1.5.0 very sluggish</title>
		<link>http://blog.kanru.info/archives/333</link>
		<comments>http://blog.kanru.info/archives/333#comments</comments>
		<pubDate>Thu, 18 Sep 2008 00:56:13 +0000</pubDate>
		<dc:creator>kanru</dc:creator>
				<category><![CDATA[Programming]]></category>
		<category><![CDATA[爬網探險]]></category>
		<category><![CDATA[exa]]></category>
		<category><![CDATA[xorg]]></category>

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			<content:encoded><![CDATA[<p>最近升到 xorg 1.5.0，某些操作 (terminal 快速更新) 會使 xserver 佔用非常多 cpu，看來是<a href="http://lists.freedesktop.org/archives/xorg/2008-September/038534.html">這個</a>問題</p>

<blockquote>
  <p>Working on it &#8230; right now it looks like:</p>
  
  <ul>
  <li><p>XShm pixmaps got accidentally reenabled in the course of 
  Adam&#8217;s changes</p></li>
  <li><p>Someone (maybe GTK, having tracked it down yet) is taking advantage<br />
  of that by creating a shared pixmap and using it as the source for
  a composite operation.</p></li>
  <li><p>That is not handled well in EXA and triggers migration of the
  destination back to system memory. (*)</p></li>
  </ul>
  
  <p>&#8211; Owen</p>
  
  <p>(*) One of the many cases where we&#8217;d be better off creating temporaries
  in video memory to avoid migration.</p>
</blockquote>

<p>測測..</p>
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		<title>video-intel 2.5 &amp; EXA</title>
		<link>http://blog.kanru.info/archives/307</link>
		<comments>http://blog.kanru.info/archives/307#comments</comments>
		<pubDate>Mon, 01 Sep 2008 10:06:34 +0000</pubDate>
		<dc:creator>kanru</dc:creator>
				<category><![CDATA[Debian]]></category>
		<category><![CDATA[Linux]]></category>
		<category><![CDATA[Programming]]></category>
		<category><![CDATA[exa]]></category>
		<category><![CDATA[gem]]></category>
		<category><![CDATA[intel]]></category>

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			<content:encoded><![CDATA[<p>video-intel 自從 2.2 版就預設使用 EXA 加速，而這個新一代的加速引擎卻因為在文字的顯示上非常緩慢，掩蓋了 EXA 本身的優良特性，Debian BTS 上也<a href="http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=451571">怨聲載道</a>。video-intel 2.5 <a href="http://cworth.org/exa/i965/new_job_old_tricks/">Carl Worth</a> 終於解決了這個問題，原來是因為使用過小的 buffer，導致每次 driver 都要等待上一次 composite operation 結束才能重新使用 buffer，在加大 buffer 之後，EXA 的 text rendering 速度甚至超過了 XAA！</p>

<p>全面轉換至 EXA，引入 GEM，video-intel 的效能只會越來越好 <img src='http://blog.kanru.info/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' /> </p>
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