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	<title>Congestion Control &#8211; Noise</title>
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		<title>When &#8220;idle&#8221; isn&#8217;t idle: how a Linux kernel optimization became a QUIC bug</title>
		<link>https://noise.getoto.net/2026/05/12/when-idle-isnt-idle-how-a-linux-kernel-optimization-became-a-quic-bug/</link>
		
		<dc:creator><![CDATA[Esteban Carisimo]]></dc:creator>
		<pubDate>Tue, 12 May 2026 13:00:00 +0000</pubDate>
				<category><![CDATA[Congestion Control]]></category>
		<category><![CDATA[debugging]]></category>
		<category><![CDATA[HTTP3]]></category>
		<category><![CDATA[networking]]></category>
		<category><![CDATA[QUIC]]></category>
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					<description><![CDATA[We investigated a bug where CUBIC's congestion window became pinned at its minimum floor, causing a performance to plummet. The fix involved correctly measuring idle periods to distinguish RTT wait times from actual application idleness.]]></description>
		
		
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