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QoS Prioritisation using DSCP/DiffServ with Linux and XS708Ev2
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QoS Prioritisation using DSCP/DiffServ with Linux and XS708Ev2
Hello,
I'm trying reduce the mean-delay (round-trip-time) of my PTP packets when going over a switch and generated traffic by increasing the DSCP priority - but without success so far.
I have a XS708Ev2 and two types of data
- low priority iperf data with 9k packet size
- high priority PTP multicast data with about 100 byte packet size
I ve set the QoS of the XS708Ev2 to "802.1p/DSCP-based" (which was the default) - see attached screenshot.
Further more I ve set the DSCP field of the multicast traffic on both - sender and receiver - to CS5:
- sudo iptables -t mangle -A POSTROUTING -d 224.0.0.0/4 -j DSCP --set-dscp-class cs5
I'm not using 802.1p - so there is no VLAN tag which could overrule the DSCP value.
I verified this by wireshark:
- low priority (CS0) iperf data
- high priority (CS5) multicast PTP data
Is there something wrong with my approach - or is there another setting to enable QoS in the Switch?
I ve seen other configuration menus, which have some CoS sub-menus under QOS - but in my case only the port-based or DSCP-based setting is selectable - is this enough to get it working?
Thanks a lot in advance,
Karl
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