{"id":79,"date":"2018-12-20T11:49:37","date_gmt":"2018-12-20T11:49:37","guid":{"rendered":"https:\/\/hhk3.kau.se\/fid\/?page_id=79"},"modified":"2020-08-29T22:28:00","modified_gmt":"2020-08-29T21:28:00","slug":"introduction-to-latency","status":"publish","type":"page","link":"https:\/\/hhk3.kau.se\/latency\/modules\/introduction-to-latency\/","title":{"rendered":"Introduction to network latency"},"content":{"rendered":"<h3>Course lecture: Introduction to network latency<\/h3>\n<p><iframe loading=\"lazy\" title=\"Introduction to network latency\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/kK1V8Dw8528?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h3>A video explaining internet latency<\/h3>\n<p>The video is produced by the EU FP7 project RITE, which targeted the reduction of internet transport latency. It gives an introduction into the biggest sources of Internet latency and emphasizes the difference between bandwidth and latency.<\/p>\n<p><iframe loading=\"lazy\" title=\"Internet Latency\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/F1a-eMF9xdY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h3>Related readings<\/h3>\n<p>Historically, the communications industry and research and development within computer networking as a whole has had a strong focus on increasing data rates. This does not mean that no one within industry and the research community has understood the importance of latency. Here is an early writing on the subject by Stuart Cheshire, Networking DEST (Distinguished Engineer, Scientist, Technologist) at Apple:\u00a0 <a href=\"http:\/\/www.stuartcheshire.org\/rants\/latency.html\" target=\"_blank\" rel=\"noopener noreferrer\">It&#8217;s the Latency, Stupid<\/a>. While some of the numbers are severly\u00a0outdated, the basic principles still apply. <em>(No mandatory readings for this part.)<\/em><\/p>\n<h3>Bufferbloat community<\/h3>\n<p>The term &#8220;bufferbloat&#8221; was coined by Jim Gettys in late 2010, one of the founders behind the Bufferbloat community which has been driving much of the work on reducing latency over the last years. The <a href=\"https:\/\/www.bufferbloat.net\/\">bufferbloat.net<\/a> site contains various projects and other resources related to latency.<\/p>\n<h3>From our collaborators<\/h3>\n<p>An interview with Toke H\u00f8iland-J\u00f8rgensen, Principal Software Engineer at\u00a0Red Hat, on the importance of latency and how to reduce it. The interview touches on all the main topics covered in the course.<\/p>\n<p><iframe loading=\"lazy\" title=\"The Importance of Latency and How to Reduce It\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/elKKZ1WxqLs?start=20&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Course lecture: Introduction to network latency A video explaining internet latency The video is produced by the EU FP7 project RITE, which targeted the reduction of internet transport latency. It gives an introduction into the biggest sources of Internet latency and emphasizes the difference between bandwidth and latency. Related readings Historically, the communications industry and [&hellip;]<\/p>\n","protected":false},"author":120,"featured_media":0,"parent":77,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-templates\/full-width.php","meta":{"footnotes":""},"class_list":["post-79","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/hhk3.kau.se\/latency\/wp-json\/wp\/v2\/pages\/79","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hhk3.kau.se\/latency\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/hhk3.kau.se\/latency\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/hhk3.kau.se\/latency\/wp-json\/wp\/v2\/users\/120"}],"replies":[{"embeddable":true,"href":"https:\/\/hhk3.kau.se\/latency\/wp-json\/wp\/v2\/comments?post=79"}],"version-history":[{"count":17,"href":"https:\/\/hhk3.kau.se\/latency\/wp-json\/wp\/v2\/pages\/79\/revisions"}],"predecessor-version":[{"id":281,"href":"https:\/\/hhk3.kau.se\/latency\/wp-json\/wp\/v2\/pages\/79\/revisions\/281"}],"up":[{"embeddable":true,"href":"https:\/\/hhk3.kau.se\/latency\/wp-json\/wp\/v2\/pages\/77"}],"wp:attachment":[{"href":"https:\/\/hhk3.kau.se\/latency\/wp-json\/wp\/v2\/media?parent=79"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}