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author Dirk Olmes <dirk@xanthippe.ping.de>
date Thu, 08 Aug 2013 13:59:04 +0200
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1 Title: Fair traffic queueing using fq_codel
2 Date: 2013-08-08
3 Lang: en
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5 I've been planning on playing around with Linux' traffic shaping for quite some time now. My linux router machine is directly connected to the DSL modem - no consumer grade router box in the mix (and hence none of the vulnerabilities and security nightmares that have been discovered in those kind of boxen in the recent past).
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7 My requirements for traffice shaping are quite simple: I share some open source downloads via bittorrent but don't want the torrent traffic to block regular surfing, Skype voice calls etc.
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9 Yesterday, my friend [Holger](https://twitter.com/asynchronaut) brought the [Codel](http://www.bufferbloat.net/projects/codel/wiki) packet scheduler to my attention. [Wikipedia](http://en.wikipedia.org/wiki/CoDel) has a good explanation of the Codel algorithm.
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11 Since Codel is "no knobs", "just works", all you have to do is to enable CONFIG_NET_SCH_FQ_CODEL in the kernel config and enable codel using
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13 tc qdisc add dev ppp0 root fq_codel
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15 What can I say? I just works. I have turned off throttling on the torrent uploads and did not notice any lag in daily surfing. Skype calls sound like they did before with torrents turned off.
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17 I realize that fq_codel is not for everyone (i.e. if you use a consumer grade router box you're SOL) but it definitely helps with my use case.