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Message-ID: <825c732e-a207-a285-d419-596b173d65a3@vyos.io> Date: Wed, 29 Jul 2020 15:33:09 +0200 From: Santi <s.lorente@...s.io> To: netdev@...r.kernel.org Subject: HFSC latency control If this is not the correct place to ask these questions, please let me know if you know about any forum, mailing list, IRC channel or wherever HFSC questions could be asked and answered. I have read some HFSC theory and some old messages in the archive of this mailing list. I am testing HFSC in my lab. Traffic is correctly shaped but I do not get the expected results regarding latency. tc qdisc add dev eth0 root handle 1: hfsc default 90 tc class add dev eth0 parent 1:0 classid 1:1 hfsc ls m2 100kbps ul m2 100kbps tc class add dev eth0 parent 1:1 classid 1:10 hfsc rt m1 50kbps d 100 m2 10kbps tc class add dev eth0 parent 1:1 classid 1:20 hfsc ls m2 70kbps tc class add dev eth0 parent 1:1 classid 1:90 hfsc ls m2 10kbps tc filter add dev eth0 protocol ip parent 1:0 prio 1 u32 match ip src 192.168.10.0/24 flowid 1:10 tc filter add dev eth0 protocol ip parent 1:0 prio 1 u32 match ip src 192.168.20.0/24 flowid 1:20 I expected to have the lowest latency on packets from 192.168.10.0/24, however they get much more delayed than any other traffic. What am I doing wrong? I would like to have one example where I can see HFSC controls latency. I have seen lots of theory but very few examples, and when I test them in my lab I don't see the expected results regarding latency. I generate traffic with Ostinato and test latency with ping and qperf.
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