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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Processing delay</span></span>
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<p>In a <a href="Computer_network" title="Computer network">network</a> based on <a href="Packet_switching" title="Packet switching">packet switching</a>, <b>processing delay</b> is the time it takes <a href="Router_(computing)" title="Router (computing)">routers</a> to process the <a href="Packet_header" class="mw-redirect" title="Packet header">packet header</a>. Processing delay is a key component in <a href="Network_delay" title="Network delay">network delay</a>.
</p><p>During processing of a packet, routers may check for bit-level errors in the packet that occurred during transmission as well as determining where the packet's next destination is. Processing delays in high-speed routers are typically on the order of microseconds or less. After this nodal processing, the router directs the packet to the queue where further delay can happen (<a href="Queuing_delay" title="Queuing delay">queuing delay</a>).
</p><p>In the past, the processing delay has been ignored as insignificant compared to the other forms of network delay. However, in some systems, the processing delay can be quite large especially where routers are performing complex encryption algorithms and examining or modifying packet content.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <a href="Deep_packet_inspection" title="Deep packet inspection">Deep packet inspection</a> done by some networks examine packet content for security, legal, or other reasons, which can cause very large delay and thus is only done at selected inspection points. Routers performing <a href="Network_address_translation" title="Network address translation">network address translation</a> also have higher than normal processing delay because those routers need to examine and modify both incoming and outgoing packets.
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<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Latency_(engineering)" title="Latency (engineering)">Latency (engineering)</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.ecs.umass.edu/ece/wolf/pubs/globecom2004.pdf">Ramaswamy Ramaswamy, Ning Weng and Tilman Wolf, <i>Characterizing Network Processing Delay</i></a></span>
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<div class="mw-heading mw-heading2"><h2 id="Bibliography">Bibliography</h2></div>
<ul><li><i>Computer Networking: A Top-Down Approach</i> by Kurose and Ross. 6th edition</li></ul>
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This article is issued from <a class="external text" title="Last edited on 2023-04-15" href="https://en.wikipedia.org/wiki/?title=Processing_delay&oldid=1149938454">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.
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