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	<title>网络杂谈 &#124; 020i.com &#187; 延迟</title>
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		<title>系统中Latency的差异</title>
		<link>http://www.020i.com/2010/blog-post-589.html</link>
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		<pubDate>Sun, 28 Mar 2010 14:20:42 +0000</pubDate>
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				<category><![CDATA[My Work]]></category>
		<category><![CDATA[延迟]]></category>
		<category><![CDATA[系统设计]]></category>

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		<description><![CDATA[Jeff Dean提到不同数据访问方式latency差异 Numbers Everyone Should Know L1 cache reference                           0.5 ns Branch mispredict                            5 ns L2 cache reference                           7 ns Mutex lock/unlock                           25 ns Main memory reference                      100 ns Compress 1K bytes with Zippy             3,000 ns Send 2K bytes over 1 Gbps network       20,000 ns Read 1 MB sequentially from memory     250,000 ns Round trip <a href='http://www.020i.com/2010/blog-post-589.html'>[...]</a>]]></description>
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